0.2.3

exit logic corrected from in-game debugging: the leveldoor only sets g101-g105, the llama's script ends the level (material 16, exit cell, near the floor); stale floor record after a position jump explains the hover exit skip in jungle day 2
fly key capture lets shift, ctrl and alt through, so the play-here crosshair no longer sticks after flying fast
2026-11-07 21:18:12 +01:00 · 2026-11-07 20:57:15 +01:00 · 2026-11-07 19:32:45 +01:00 · 2026-11-07 19:09:39 +01:00 · 2026-11-07 19:03:20 +01:00 · 2026-11-07 18:34:32 +01:00
171 changed files with 7601 additions and 788 deletions
@@ -0,0 +1,25 @@
+# Builds and tests every push and pull request (tests that need the game CD skip themselves).
+name: build
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: |
+            25
+            21
+      - name: Build and test
+        run: |
+          ./gradlew --no-daemon \
+            -Porg.gradle.java.installations.fromEnv=JAVA_HOME_25_X64 \
+            -Porg.gradle.java.installations.auto-download=false \
+            build
@@ -0,0 +1,61 @@
+# Builds and publishes a release when a version tag is pushed:
+#   git tag v0.2.1 && git push origin v0.2.1
+# The release gets the four packages (full/launcher x Windows/Linux), SHA256SUMS.txt and the
+# matching CHANGELOG.md section as its text. Tests that need the game CD skip themselves here.
+#
+# Needs: Gitea Actions enabled and a runner with the label "ubuntu-latest" (act_runner).
+# The built-in token is used; if it may not create releases on your instance, add a repository
+# secret RELEASE_TOKEN (a token with write access to the repository).
+name: release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: JDK 25 (toolchain) and 21 (runs Gradle)
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: |
+            25
+            21
+
+      - name: Version from the tag
+        run: |
+          V="${GITHUB_REF_NAME#v}"
+          echo "VERSION=$V" >> "$GITHUB_ENV"
+          python3 tools/release/changelog_section.py "$V" > release-notes.md
+          echo "Release $V"; head -5 release-notes.md
+
+      - name: Build, test and package
+        run: |
+          ./gradlew --no-daemon \
+            -Porg.gradle.java.installations.fromEnv=JAVA_HOME_25_X64 \
+            -Porg.gradle.java.installations.auto-download=false \
+            -PreleaseVersion="$VERSION" \
+            build packageAll
+
+      - name: Checksums
+        run: |
+          cd build/dist
+          ls -la
+          sha256sum LlamaMod-"$VERSION"-*.zip LlamaMod-"$VERSION"-*.tar.gz > SHA256SUMS.txt
+          cat SHA256SUMS.txt
+
+      - name: Publish
+        env:
+          GITEA_URL: ${{ github.server_url }}
+          GITEA_REPO: ${{ github.repository }}
+          GITEA_TOKEN: ${{ secrets.RELEASE_TOKEN || github.token }}
+        run: |
+          python3 tools/release/publish_gitea.py \
+            --tag "$GITHUB_REF_NAME" --title "LlamaMod $VERSION" --notes release-notes.md \
+            build/dist/LlamaMod-"$VERSION"-*.zip build/dist/LlamaMod-"$VERSION"-*.tar.gz \
+            build/dist/SHA256SUMS.txt
@@ -1,5 +1,6 @@
 # game data (copyrighted) - never commit
 re/groove.exe
+re/groove_en.exe
 re/groove_decomp.c
 re/proj/
 re/ghidra.log
@@ -0,0 +1,117 @@
+# Changelog
+
+## 0.2.3 – 2026-11-07
+
+- **Editor:** flying with the right mouse button + W A S D / Q E now works even when another part of
+  the window (a text field, a dock) still had the keyboard focus.
+- **Editor:** the block, pillar and invisible-box icons sat too low in the toolbars (drawn outside
+  their box); a test now keeps every icon inside its 16 × 16 box.
+- **Tutorials** say where the Objects panel is (the ⊙ tab next to *Outliner*).
+
+## 0.2.2 – 2026-11-07
+
+- **English game version supported.** All exe mods (boot to level, cheats, intro skip, practice
+  tools, free camera) and the base patch now also work with the English groove.exe of
+  2000-10-17. With any other version LlamaMod warns at start and before the first Apply (nothing
+  is blocked); mods that change groove.exe then stop with a clear message.
+- **Display diagnostics option renamed and explained.** The cheats option is now called
+  "Troubleshooting: write display diagnostics" and warns that the game switches through every
+  screen mode of every monitor at start (screens go black for a while). It stays off by default.
+
+## 0.2.1 – changes since 0.1.0
+
+The first test release was 0.1.0 (launcher edition). Everything below is new for testers.
+There are two downloads: **full** (launcher + level editor) and **launcher** (mods only).
+
+### Launcher
+
+- **Clearer texts everywhere.** Mod descriptions and options are explained in plain words,
+  directly under each option instead of only in tooltips.
+- **Setup wizard**
+  - Wrong files, truncated ISO downloads and too little disk space are caught when you
+    pick the source, not after you click Set up.
+  - Copy progress shows megabytes ("123 of 568 MB").
+  - Cancel tells you what happened.
+- **Play**
+  - While the game runs, Play becomes **Quit game**, so a hung game can be stopped from LlamaMod.
+  - A crash now says "The game crashed" with advice, instead of only "The game has ended".
+  - Wine: a too-old Wine version gives a warning, and a wrong Wine command is explained.
+- **Safer applying**
+  - Two LlamaMod windows (or the command line) can no longer break each other's apply.
+  - If LlamaMod is closed in the middle of applying mods, it finishes or rolls back the
+    apply on the next start and tells you.
+  - Settings changed in one window show up in the other.
+  - Old cached mod results are rebuilt after an update.
+- **Mods**
+  - **Mirror mode:** pick the worlds with check boxes.
+  - **Practice and Free camera:** if two hotkeys use the same key, Apply refuses and says
+    which ones clash.
+  - **Boot to level:** a custom start position belongs to its level and no longer breaks
+    other levels.
+  - **Intro skip and Boot to level** can now be used together.
+  - **Test World:** a new gallery with all 253 characters, enemies, animals and objects
+    of the game, standing still on pedestals (the animal pen is gone).
+  - **New levels and the Alligator Arena only use TestLevel chapters 1 and 32–49.** On other
+    chapters the game stored the level's coins over your progress and other game data (chapter 9
+    broke the world map). Levels and settings on old chapters move to a free one automatically.
+    The game itself is fixed too: picking an empty TestLevel chapter on the world map (or in
+    Boot to level) no longer damages your progress.
+  - The level tally shows the real coin and secret totals of new levels, the Test World and the
+    arena instead of the Village's "55".
+  - **New: Alligator Arena** – a minigame on a TestLevel chapter (default 49): alligators come in
+    waves into a walled pit; every hit costs one of their lives and coins pop out, their bite
+    costs your energy; beat every wave and the exit opens. Lives, waves, energy and coins per hit
+    can be set.
+  - **New: Llama Coaster** – a roller-coaster ride on a TestLevel chapter (default 48), with the
+    cart from the Catacombs: drops, climbs, boost arrows, a jump and a spin pad. Two tracks, 1–3
+    laps, three speeds.
+- **Save games**
+  - Backups can no longer overwrite each other.
+  - Import… opens in the backups folder.
+  - The table fits small (1280×720) screens.
+- **Layout:** works on small and laptop screens; the dark theme is easier to read.
+
+### Level editor (full edition)
+
+- **Play-test**
+  - Shows "Game running" and a **Stop game** button.
+  - Shift+F5 shows a crosshair where the llama will start.
+  - Play-test copies are removed when the game ends, and your mod selection comes back.
+- **Readable names.** "Coin 3", "Floor 2", "Waypoint 4" instead of internal ids, in the
+  outliner, inspector, status bar and messages; the outliner filter finds them.
+- **Error messages.** Damaged files give one plain sentence with optional details.
+- **Geometry**
+  - Painting or erasing tiles in one drag is one undo step.
+  - New tile option **No collision** (walk-through decoration).
+- **Meshes and export**
+  - **Export level as glTF/GLB** (textures, vertex colours; optionally only the selection,
+    or collision as a separate mesh).
+  - Imported and exported models are **no longer mirrored** compared to Blender. Meshes in
+    older projects keep their look; switch them to "right" handedness in the inspector to
+    fix them.
+- **Objects**
+  - **Guards** and **alligators** need a waypoint box around them, or the game removes
+    them. The editor now sets this up automatically and warns when it is wrong. It also
+    says which objects can trigger a guard's event bit.
+  - The start camera no longer starts inside the llama's head on some base levels. Moving
+    the player start moves its camera and intro fly-by too.
+  - Snap to floor follows the game's own rule.
+- **Object scripts**
+  - Custom object types can be edited and deleted (with undo).
+  - **Script language with compiler:** if/else, loops, switch, events, named parameters.
+  - The script view is much easier to read.
+  - Opcodes have checked descriptions.
+- Narrow docks, small windows and long labels wrap instead of being cut off.
+
+### Documentation
+
+- New guide for building your own levels, a reference of the game's file formats and engine
+  limits, and a chapter on object scripts (strats) with the arena and the coaster as worked
+  examples: start at [docs/README.md](docs/README.md).
+
+### Known limits
+
+- Tested on Linux (Wine) and in a Windows VM. Real Windows hardware is not tested yet.
+- The game draws objects only within about 12 units of the llama.
+- Four music tracks of the game have no file on the CD (GAMEOVER, TALLY, PUZZLE2, PLATFORM); the
+  editor marks them.
@@ -1,268 +1,172 @@
-# levelbau – level modding kit for *The Emperor's New Groove* (PC, 2000)
+# LlamaMod – mods and a level editor for *The Emperor's New Groove* (PC, 2000)

 German title: *Ein Königreich für ein Lama*. PC port by Argonaut, built on the Croc 2 engine.

-This kit came out of an AI-assisted reverse-engineering project. It contains:
+**LlamaMod** is a one-click mod manager and a full 3D **level editor** for the PC game, for
+**Windows and Linux**. It installs the game from your own CD or ISO into its own folder, applies
+mods without ever touching the original files, and lets you build new levels, edit the original
+ones and share them as small files. Everything is based on a complete reverse engineering of the
+game's level formats and its object scripts ("strats").

-* **Format documentation** for the level files (`*.wad`): geometry, collision, object
-  placement, textures, waypoints, visibility zones, and what makes the level exit work.
-* **Python tools** that read, export and rebuild those files byte-exactly.
-* **A level builder** (`tools/levelbuild.py`). You describe a level as a short Python script
-  (boxes, ramps, stairs, fences, trees, sea, objects) and it writes a complete, playable WAD.
-* **An example level, "Testwelt"** (`levels/testwelt.py`). It goes into the hidden, empty
-  *TestLevel* slot (world 9, chapter 1) and has its own geometry, a gallery with every
-  object type on pedestals, an animal pen and a small parkour with a working exit.
-* **A debug patch generator** (`tools/debugviz.py`). It makes collision visible in every
-  level, including invisible walls, along with invisible trigger and camera objects.
-* **An automated in-game tester** (`tools/lamatest.py`). On Linux it runs the game under
-  Wine on a virtual display, loads the test level, takes screenshots and detects crashes.
+![The LlamaMod launcher: tick mods, set their options, Apply and Play](docs/img/readme-launcher.jpg)

-Nothing from the game itself is included: no game files, no executable, no decompiled
-code, no built WADs. Every tool works on **your own copy** of the game.
+*The launcher: tick the mods you want, set their options, click Apply and Play.*

-> The notes in `notes/` are detailed and technical. Handing them to an AI assistant is the
-> recommended way to use this kit (see the last section).
+![The LlamaMod level editor with Village chapter 1 open](docs/img/readme-editor.jpg)

---
+*The level editor with Village chapter 1 open: outliner (left), 3D view, inspector (right), assets and scripts (bottom).*

-## Requirements
+More pictures:

-* Your own copy of the game. Development used the **German CD version**. Other language
-  versions should use the same format, but this hasn't been tested.
-* Python 3.8+ with `numpy` and `Pillow`. Optional: `capstone` (disassembler helper).
-* For the automated in-game tests only: Linux, Wine, Xvfb, xdotool, ImageMagick, tesseract
-  with German language data, and PulseAudio (`pactl`).
-* Optional: Blender (preview renders), and Ghidra (to regenerate the decompile, see below).
+| | |
+|---|---|
+| ![Test World gallery](docs/img/testworld-gallery.jpg) | ![Alligator Arena](docs/manual/img/mod_arena.jpg) |
+| **Test World**: all 253 figures and objects of the game in one level | **Alligator Arena**: a minigame with new, scripted enemies |
+| ![Llama Coaster](docs/manual/img/mod_coaster.jpg) | ![Debug view](docs/img/debug-view.jpg) |
+| **Llama Coaster**: a new roller coaster track for the catacombs cart | **Debug view**: collision and invisible objects in the running game |
+| ![glTF in Blender](docs/img/gltf-blender.jpg) | |
+| **glTF/OBJ** export and import for Blender | |

-The builder and the export tools are plain Python, so they should also work on Windows.
-The test harness is Linux/Wine-only.
+## Features

-### Paths – adjust these
+* **Mods** – tick, *Apply*, *Play*: Test World, Alligator Arena, Llama Coaster, your own levels, Boot to level,
+  Intro skip, Mirror mode, Practice tools (save/restore position, extra checkpoints), Randomizer,
+  Draw distance, Built-in cheats, Debug wireframe, Free camera & noclip.
+* **Level editor** – new levels from templates or editing the original levels; brushes, the base
+  level's tiles, OBJ/glTF meshes; textures (import, paint, animate); objects from **every world**;
+  waypoints, cameras, triggers; fog, music, lights, visibility regions; strat scripts (read,
+  change numbers, write new object types); checks for problems; **F5** starts the game directly in
+  the level.
+* **Sharing** – a level is a small `.llamalevel` file with only your changes and no game data; the
+  receiver's LlamaMod builds it from their own copy. New levels live in the hidden *TestLevel*
+  world.
+* **Save games** – unlock worlds and chapters, coins, collectibles; backups before every change.
+* **Safe** – the original CD/ISO and files are never changed; *Restore original* switches all mods
+  off.

-The tools were written for one Linux/Wine setup and some paths are hard-coded at the top of
-the scripts:
+## Get it

-| Script | Variable | Meaning |
-|---|---|---|
-| `tools/levelbuild.py` | `WADS` | folder with the original level WADs (the `wads` folder of the game CD) |
-| `tools/levelbuild.py` | `MODWAD` | where `--install` puts the built level (`T1L9M001.wad`) |
-| `tools/debugviz.py` | `CD_WADS` | same as `WADS` |
-| `tools/lamatest.py` | `PREFIX`, `LAMA_MOD` | Wine prefix and the overlay script |
+You need **your own copy of the game** (the CD or an ISO image of it). Nothing else – LlamaMod
+brings everything it needs (also Java).

-The game reads its level data from the CD drive, in the `wads` folder of the CD. To mod it,
-make a copy of the CD data (or an overlay of symlinks, see `tools/lama-mod`), point the CD
-drive or `CDPath` at that copy, and put modified WADs into its `wads` folder.
+**Supported game versions:** the **German CD** (*Ein Königreich für ein Lama*, `groove.exe` of
+2001-02-12 – the version everything was developed and tested with) and the **English first release**
+(*The Emperor's New Groove*, `groove.exe` of 2000-10-17). With any other version the level mods
+(Test World, Arena, Coaster, your own levels, Mirror, Randomizer, Draw distance, Debug wireframe)
+should still work; the mods marked *modifies groove.exe* stop with a clear message instead – then
+please send us that `groove.exe` so we can add it.

---
+### Install in 5 steps

-## Folder layout
+1. **Download** from the **Releases** page of this repository (top of the page):
+   * Windows: `LlamaMod-<version>-full-windows-x64.zip`
+   * Linux: `LlamaMod-<version>-full-linux-x64.tar.gz`

-```
-README.md              this file
-notes/                 format documentation and findings
-  geometry.md          TRAK/MAP geometry, collision polygons, coordinate spaces, zones, limits
-  objects.md           MAP chunk layout, strat (object) entries, waypoints, player start, exit
-  strat_types_table.md every object type in every original level, with counts
-  textures.md          TEXT chunk: texture pages, RLE16, texture table, animations
-  levelbau.md          how to use levelbuild.py, measured player physics, exit logic
-  testharness.md       the automated Wine/Xvfb tester
-  debugviz.md          debug patch: colour legend, what is shown, limits
-  img/                 screenshots and preview renders
-tools/
-  geomlib.py           core library: WAD, TRAK, STPC models, MAP geometry, TEXT, collision
-  geom_export.py       WAD -> OBJ/MTL (+ textures, vertex colours, collision.obj, objects.obj)
-  geom_import.py       OBJ -> new geometry inside a WAD copy
-  mapchunk.py          MAP chunk parser/writer (byte-exact on all original levels)
-  strats.py, strat_table.py, stpcwalk.py, map_dump.py   object types and strat code helpers
-  textchunk.py, text_export.py, texsheet.py             textures: export/import PNG, contact sheets
-  levelbuild.py        the level builder (see notes/levelbau.md)
-  debugviz.py          debug patch generator (collision/trigger visualisation)
-  lamatest.py          automated in-game test on a virtual display (Linux/Wine)
-  lama-mod             shell script: builds a CD overlay with modded WADs (Wine setup)
-  vorschau/            Blender preview render scripts
-  disx86.py            small disassembler helper for groove.exe (needs capstone)
-  wadtool.py           minimal WAD chunk lister/extractor/replacer (used by several tools)
-  cor2png.py, png2cor.py  loading/concept pictures (*.COR, LZ-compressed 640x480) <-> PNG
-  asf2wav.py           music (*.ASF, 4-bit ADPCM) -> WAV
-levels/
-  testwelt.py          the example test world
-  testwelt_parkour.seq scripted run through the parkour (used with lamatest.py)
-  sprunglabor.py       "jump lab": test lanes used to measure jump height/width
-re/ghidra_scripts/
-  DumpAll.java         Ghidra headless script: decompiles every function to one C file
+   (*full* = with the level editor. The *launcher* packages are the same without the editor.)
+2. **Unpack** it into any folder you like (for example *Documents* or your home folder).
+   There is no installer and you need no admin rights.
+3. **Start** LlamaMod:
+   * Windows: double-click **`LlamaMod.exe`**. If Windows says *"Windows protected your PC"*,
+     click **More info → Run anyway** (the program is not signed, that's all).
+   * Linux: install Wine once (`sudo apt install wine` on Ubuntu/Mint/Debian), then double-click
+     **`LlamaMod`** or run `./LlamaMod`. `./install-desktop-entry.sh` adds it to your app menu.
+4. **Set up the game** – on the first start a short wizard asks for your game: put the CD in or
+   pick the ISO file, click **Set up** and wait about a minute. Your CD/ISO is only read, never
+   changed.
+5. **Play** – on the **Mods** tab tick the mods you want, click **Apply**, then **Play**.
+   *Restore original* switches all mods off again.
+
+New levels (Test World, Alligator Arena, Llama Coaster, your own) are in the hidden world
+**TestLevel**: open the **Save games** tab once and click **Unlock TestLevel**, then pick it on the
+world map. If your antivirus complains about `groove.exe`: mods that change the game program are
+marked *modifies groove.exe*; LlamaMod tells you what to do. More help:
+[Troubleshooting](docs/manual/20-troubleshooting.md). What changed: [CHANGELOG.md](CHANGELOG.md).
+
+### Build from source
+
+Needs a JDK 25 (toolchain) and Gradle running on Java 21 (for Spotless):
+
+```bash
+./gradlew spotlessApply build fatJar   # tests + build/libs/llamamod-<ver>-all.jar
+java -jar build/libs/llamamod-*-all.jar            # LlamaMod
+java -jar build/libs/llamamod-*-all.jar --editor   # the level editor alone
+./gradlew packageAll                   # Linux + Windows packages, full and launcher edition
 ```

---
+Details: [For developers](docs/developers.md).

-## Quick start
+## Documentation
+
+**[docs/](docs/README.md)** – start there.
+
+* **[Build your own level](docs/guide/README.md)** – a step-by-step guide for newcomers.
+* **[Level editor manual](docs/manual/index.md)** – every tool and dialog, with tutorials (also
+  built into the editor: **F1**).
+* **[Reference](docs/reference/README.md)** – file formats (WAD, geometry, collision, objects,
+  textures, music), TestLevel, engine limits.
+* **[Strats](docs/strats/README.md)** – how the game's object scripts work, the script language,
+  custom object types, and the [Alligator Arena walkthrough](docs/strats/arena.md).
+* **[Tools](docs/tools.md)** – the app's command line, the Python kit, in-game test harnesses.
+* **[Lab notes](notes/README.md)** – the detailed engineering notebook.
+
+## The Python kit
+
+The project started as a Python reverse-engineering kit, which is still in [`tools/`](tools/):
+byte-exact parsers and writers for every level chunk, OBJ export/import, a script-driven level
+builder ([`tools/levelbuild.py`](tools/levelbuild.py), example [`levels/testwelt.py`](levels/testwelt.py)),
+texture and picture converters, a music decoder, the debug-view generator and an automated
+in-game tester for Linux/Wine. Python 3.8+ with `numpy` and `Pillow`.

 ```bash
 # export a level to OBJ (+ collision and object markers)
 python3 tools/geom_export.py /path/to/cd/wads/t1l1m001.wad out_village --collision --objects
-#   -> level.obj/.mtl, texture pages, collision.obj, objects.obj, preview images
-
-# build the example test world
-python3 tools/levelbuild.py levels/testwelt.py testwelt.wad
+# build the original test world from its script
+python3 tools/levelbuild.py levels/testwelt.py testwelt.wad --base /path/to/cd/wads/t1l1m001.wad
 python3 tools/levelbuild.py --types               # object types you can place
-python3 tools/levelbuild.py --textures tex.png    # texture sheet with the names you can use
-
-# build the debug patch for all levels
-python3 tools/debugviz.py --help
+# music to WAV, loading picture to PNG
+python3 tools/asf2wav.py /path/to/cd/music/Village.asf village.wav
+python3 tools/cor2png.py /path/to/cd/t111.cor t111.png
 ```

-### Playing the test level
+Where the tools look for the game files (or pass `--base`/`--src`):

-The game has a hidden world 9, *TestLevel*, with 49 chapter slots, but the retail game ships
-no data for it. Put your built WAD into the CD's `wads` folder as `T1L9M001.wad`. Also add a
-loading picture `T191.COR`, for example a copy of another `T1xx.COR`.
+| Variable | Meaning | Default |
+|---|---|---|
+| `LLAMAMOD_CD` | the CD folder (`wads/`, `music/`, …), also for the Gradle tests | `~/.wine-lama/iso-dk/Setup/Eng/Cd` |
+| `LAMA_WINEPREFIX` | Wine prefix of a hand-made game setup (`lamatest.py`, `levelbuild.py --install`) | `~/.wine-lama` |
+| `LAMA_MOD` | the `lama-mod` script used by `lamatest.py` | `~/.local/bin/lama-mod`, else `tools/lama-mod` |
+| `APPTEST_ROOT`, `APPTEST_ISO` | session folders and ISO of `apptest.py` | `~/.cache/llamamod-apptest` (`$CLAUDE_JOB_DIR/tmp` if set), `~/Downloads/GROOVE_DK.iso` |
+| `LLAMAMOD_DATA` | data folder of the app | `~/.local/share/LlamaMod` (Windows `%LOCALAPPDATA%\LlamaMod`) |

-To reach world 9, edit a save file (`king0.ksv`…`king2.ksv`, 256 bytes):
+All tools and variables: [docs/tools.md](docs/tools.md#paths).

-* `+0x04/+0x05` = map cursor (world, chapter)
-* `+0x3f/+0x40` = current world/chapter
-* `+0x42/+0x43` = highest unlocked world/chapter
+### Key facts in one minute

-Set them to world 9, chapter 1.
+* **The world is made of tiles.** TRAK holds 100–650 small models (render triangles + collision
+  polygons); MAP places them on a W × H grid with height and rotation, plus baked vertex colours
+  and a 32-region visibility table. No BSP, no single world mesh.
+* **Objects are "strats"**: compiled scripts in STPC. An object's type is its byte offset into
+  STPC, so a level can only use the types its own STPC contains (or types merged in from other
+  levels).
+* **Scale**: y up, one unit per grid cell; the llama is 0.6 tall, walks 1.1 units/s, steps up
+  nothing and jumps ~1.3 far.
+* **The exit** fires only when the llama stands in the LevelDoor's grid cell **on floor with
+  collision material 16**.
+* **Textures** are PlayStation-style 15-bit pixels on 256 × 256 pages; there are no free UVs.

-When you leave through the exit, the game unlocks the next chapter. `levelbuild.py --install`
-therefore links chapters 2–49 to the same file, so that picking one on the map doesn't crash.
+More: [docs/reference](docs/reference/README.md).

-### Debug patch: visible collision and invisible walls
+### Building on this with an AI assistant

-```bash
-python3 tools/debugviz.py --all debug_wads --src /path/to/cd/wads   # all 33 level WADs
-python3 tools/debugviz.py t1l1m001.wad t1l1m001_debug.wad           # a single level
-python3 tools/debugviz_check.py debug_wads /path/to/cd/wads         # offline sanity check
-```
+This whole project was made by an AI coding agent (Claude Code). To continue it, give an assistant
+the [lab notes](notes/README.md) first – they contain offsets, field meanings, confidence levels and
+pitfalls – and let it regenerate the decompile of `groove.exe` with Ghidra for questions about game
+logic (headless `DumpAll` script, see [Tools](docs/tools.md#reverse-engineering)). Always test in the
+game (`tools/apptest.py`) and change one thing at a time: the engine crashes on inconsistent data.

-Put the resulting WADs into the CD's `wads` folder in place of the originals, keeping the
-same file names. On the Wine setup, `lama-mod debug an|aus` toggles them. The patch only
-adds render geometry. Collision, objects, waypoints and zones stay byte-identical, so
-gameplay is unchanged.
+## Legal

-Legend (full version in `notes/debugviz.md`):
-
-| Colour | Meaning |
-|---|---|
-| green / yellow-green wireframe | walkable floor / slope |
-| blue | wall |
-| orange | ceiling / overhang |
-| **red, semi-transparent fill** | **invisible collision**: invisible walls and floors |
-| magenta lines | death plane ("no floor") |
-| violet fill | level exit floor (material 16) |
-| other colours | special collision materials |
-
-| Marker | Meaning |
-|---|---|
-| white arrow | player start |
-| violet cube | exit |
-| turquoise cube | checkpoint |
-| cyan cube | camera |
-| yellow cube | trigger / cutscene |
-| orange cube | force or special zone |
-| gold cube | secret zone |
-| grey cube | other invisible helper object |
-| pink wire box | ambience / music / fog zone |
-
-Cubes sit on a stick, and a horizontal line shows the object's facing. Wire boxes show
-trigger areas.
-
-Status: 19 of 33 levels were loaded in the game without problems. The rest
-(catacombs/roller coaster world 7, lab world 8, two others) passed the offline check only.
-Collision of moving objects (platforms, doors) is not shown.
-
---
-
-## LlamaMod and the level editor
-
-Besides the Python kit, this repository contains **LlamaMod** (Java 25, Swing; `src/`), a
-one-click mod manager for the game on **Windows and Linux**, and a full **3D level editor**
-built into it. Nothing from the game is included: the wizard installs the game from your own
-CD/ISO into LlamaMod's data folder, and all mods are built from that copy.
-
-* **Mods** – tick mods, click *Apply*/*Play*: debug wireframe, Test World, randomizer, fog,
-  mirror mode, intro skip, cheats, practice tools, free camera, *boot to level* … Mods may change
-  level files and `groove.exe` (code caves); the original files are never touched.
-  Developer notes: `notes/llamamod-app.md`, one `notes/mod-*.md` per mod.
-* **Level editor** (*Level Editor* button, or `LlamaMod --editor`): create new levels from
-  templates, brushes and the base level's tile models and objects, or edit the original
-  levels; import OBJ/glTF meshes and PNG/JPG textures (texture manager, paint-on-faces,
-  animations); waypoints, zones, fog, lights, visibility regions; **Play (F5)** builds the
-  level and starts the game directly in it (Escape returns to the editor).
-* **Sharing**: a level is a small `.llamalevel` file with only your changes. Others import it in
-  LlamaMod (*Mods → Levels → Import level*) and it is built from their own game copy; new levels
-  appear in the hidden *TestLevel* world (chapters 1–49).
-
-User guide (English): **`notes/editor-guide.md`**. In the editor: *Help → Getting started*
-and *Help → Shortcut sheet*. Technical notes: `notes/editor-design.md`, `editor-api.md`,
-`editor-format.md`, `editor-render.md`, `editor-ui.md`, `editor-tools-*.md`,
-`editor-playtest.md`.
-
-```bash
-./gradlew build fatJar          # tests + build/libs/llamamod-<ver>-all.jar
-./gradlew packageLinux          # build/dist/LlamaMod-<ver>-full-linux-x64.tar.gz (own Java runtime)
-./gradlew packageWindows        # build/dist/LlamaMod-<ver>-full-windows-x64.zip (LlamaMod.exe + runtime)
-./gradlew packageAll            # both systems, full and launcher (no editor) edition
-java -jar build/libs/llamamod-*-all.jar            # LlamaMod
-java -jar build/libs/llamamod-*-all.jar --editor   # the level editor alone
-```
-
-![The level editor](notes/img/editor/ui_select_move.jpg)
-
---
-
-## Key facts
-
-* **The world is made of tiles.** TRAK holds about 100–650 small models: render triangles
-  plus collision polygons. MAP places them on a W×H grid (96×96 in the village) with height
-  and rotation. MAP also stores baked vertex colours and a 32-zone visibility table. There is
-  no BSP and no single world mesh.
-* **Objects are "strats".** These are compiled scripts in the STPC chunk. In MAP, an object's
-  type is simply its **byte offset into STPC**. A level can therefore only use the object
-  types its own STPC contains. The builder uses the village (`t1l1m001`) as its base.
-* **Coordinates and scale.** y points up. Fixed point 20.12 for objects, 4096 = 360° for
-  angles, and render space vs. game space have z mirrored. The llama is about 0.6 units
-  tall, runs about 1.1 units/s, can step up at most about 0.35 and jumps about 1.3 units
-  far with a run-up.
-* **The level exit (LevelDoor)** is an invisible trigger. It fires only when the llama
-  stands in its grid cell **on floor with collision material 16**. Its parameters are
-  (tribe, world, chapter) of the next level.
-* **Texture pixels** are PS1-style 15-bit BGR, RLE16-compressed, on 256×256 pages. The
-  value 0x0000 means transparent.
-
-The parsers rebuild every original WAD byte-for-byte, so they can be trusted as format
-specs.
-
---
-
-## Building on this with an AI assistant
-
-This whole kit was made by an AI coding agent (Claude Code) working through the steps
-below. Any capable assistant that can run code should be able to continue.
-
-1. **Give it the notes first.** Ask it to read `notes/*.md`. They contain offsets, field meanings, confidence levels and pitfalls.
-2. **Regenerate the decompile** for questions about game logic. Install Ghidra and a full
-   JDK (version 25 for Ghidra 12.x), then run
-   `analyzeHeadless <projdir> groove -import groove.exe -scriptPath re/ghidra_scripts -postScript DumpAll.java groove_decomp.c`.
-   This writes all functions as C (about 2 MB) for the assistant to search with grep.
-   Loader functions worth knowing: MAP `0x42ac50`, TRAK `0x42aac0`, STPC `0x42ab50`, strat
-   interpreter `0x54d180`.
-3. **Always test in the game.** Have the assistant load and screenshot every build. On
-   Linux, `tools/lamatest.py run <wad> <outdir>` does this unattended in about 75 s. On
-   Windows, test by hand or adapt the script.
-4. **Change one thing at a time** and keep the original WADs untouched. The game crashes on
-   inconsistent data: tiles outside the grid, a vertex-colour block that doesn't match the
-   vertex counts, or missing chapters.
-
-### Ideas for what to try next
-
-* Use object types from other levels. You would have to merge and relocate their STPC
-  code and their textures.
-* ~~Import custom textures~~ – done in the level editor (texture manager, import, painting).
-* ~~Make a real visual editor~~ – done: the LlamaMod level editor (see above).
-* Add custom music or sounds (SMPC/AMPC/SRPC are sound banks).
-
---
-
-This is a non-commercial fan project, not affiliated with Disney or Argonaut. Please share
-only tools and your own content, not the game's files.
+This is a non-commercial fan project, not affiliated with Disney Interactive or Argonaut Games.
+**No game files are included** – no executable, no level data, no music, no decompiled code. You
+need your own copy of the game; every tool works on that copy. Please share only tools and your own
+content (`.llamalevel` projects contain only your changes), not the game's files.
@@ -4,7 +4,8 @@ plugins {
 }

 group = 'com.eliasmueller.llamamod'
-version = '0.2.0'
+// Release builds pass -PreleaseVersion=<tag without v> (see .gitea/workflows/release.yml).
+version = findProperty('releaseVersion') ?: '0.2.3'

 repositories {
    mavenCentral()
@@ -92,11 +93,14 @@ processResources {

 test {
    useJUnitPlatform()
-    // golden tests: -Dllamamod.cd=<cd dir> -Dllamamod.ref=<python reference dir>
-    systemProperty 'llamamod.cd', System.getProperty('llamamod.cd', "${System.getProperty('user.home')}/.wine-lama/iso-dk/Setup/Eng/Cd")
+    // golden tests: -Dllamamod.cd=<cd dir> (or env LLAMAMOD_CD) -Dllamamod.ref=<python reference dir>;
+    // tests that need the CD are skipped when the folder does not exist
+    systemProperty 'llamamod.cd', System.getProperty('llamamod.cd', System.getenv('LLAMAMOD_CD') ?: "${System.getProperty('user.home')}/.wine-lama/iso-dk/Setup/Eng/Cd")
    systemProperty 'llamamod.ref', System.getProperty('llamamod.ref', '')
    // level builder references: python3 tools/levelbuild.py levels/testwelt.py <lbref>/testwelt.wad etc.
    systemProperty 'llamamod.lbref', System.getProperty('llamamod.lbref', '')
+    // English groove.exe (2000-10-17) for the version tests; never committed, skipped when absent
+    systemProperty 'llamamod.exeEn', System.getProperty('llamamod.exeEn', "${projectDir}/re/groove_en.exe")
    maxHeapSize = '2g'
 }

@@ -0,0 +1,77 @@
+# LlamaMod documentation
+
+Documentation for modding *The Emperor's New Groove* (PC, 2000; German: *Ein Königreich für ein
+Lama*) with LlamaMod: building levels, the game's file formats, and how the game's object scripts
+("strats") work.
+
+![The Test World: every figure of the game in one level](img/testworld-gallery.jpg)
+
+## Start here
+
+| If you want to … | read |
+|---|---|
+| build your own level | **[Guide: Build your own level](guide/README.md)** |
+| look something up in the editor | [Level editor manual](manual/index.md) (also in the editor: **F1**) |
+| know the numbers and rules of the engine | [Design rules](guide/design-rules.md) |
+| build levels from code | [Levels from scripts](guide/levels-in-code.md) |
+| understand the game's data | [Reference](reference/README.md) |
+| change or write object behaviour | [Strats](strats/README.md) |
+| find a tool | [Tools](tools.md) |
+| work on LlamaMod itself | [For developers](developers.md) |
+
+## Contents
+
+**[Guide](guide/README.md)** – for level builders
+* [Build your own level](guide/README.md): setup, editor basics, ground, start and exit, objects,
+  look and feel, play-test, sharing
+* [Design rules](guide/design-rules.md): sizes, jump distances, the rules that keep a level working
+* [Levels from scripts](guide/levels-in-code.md): Python and Java level builders, the editor's
+  command line
+
+**[Level editor manual](manual/index.md)** – every tool, panel and dialog of the editor, with
+tutorials (first level, parkour, editing an original level, Blender import)
+
+**[Reference](reference/README.md)** – the game's data
+* [Game files](reference/game-files.md): folders, naming scheme, worlds, COR pictures, movies,
+  save games
+* [WAD container](reference/wad.md): the chunks of a level file
+* [Geometry and collision](reference/geometry.md): tiles, grid, coordinate spaces, collision
+  materials, visibility regions
+* [Objects, waypoints, zones](reference/objects.md): strat records, parameters, the exit,
+  environment zones, lights
+* [Textures](reference/textures.md): pages, pixels, texture rectangles, animations
+* [Music and sound](reference/audio.md): ASF music, sound banks, speech – known and unknown
+* [TestLevel (world 9)](reference/testlevel.md): where custom levels live, safe chapters
+* [Engine facts and limits](reference/engine-limits.md): scale, draw distance, memory, crashes
+
+**[Strats](strats/README.md)** – object behaviour
+* [How the strat VM works](strats/README.md): units, frames, variables, events, spawning,
+  collision
+* [Reading scripts](strats/reading-scripts.md): the Script view and the assembly
+* [The script language](strats/script-language.md): writing new behaviour
+* [Customising strats](strats/custom-types.md): constants, imports, clones, custom types, mods
+* [Example: the Alligator Arena](strats/arena.md): a complete minigame explained step by step
+* [Example: the roller coaster](strats/roller-coaster.md): a new ride for the game's own coaster cart – track data and waypoints, no new strat code
+
+**[Tools](tools.md)** – LlamaMod's launcher, editor and command line, the Python kit, the in-game
+test harnesses
+
+**[For developers](developers.md)** – build, code map, writing a mod, maintaining the manual
+
+**[Lab notes](../notes/README.md)** – the detailed engineering notebook behind all of this
+
+## Pictures
+
+| | |
+|---|---|
+| ![LlamaMod launcher](img/launcher.jpg) | ![Level editor](img/editor.jpg) |
+| The launcher: mods with options, save games, settings | The level editor with Village 1 |
+| ![Alligator Arena](manual/img/mod_arena.jpg) | ![Debug view](img/debug-view.jpg) |
+| The Alligator Arena minigame | Debug view: collision and invisible objects in the game |
+
+## Status and honesty
+
+Everything here was found by reverse engineering and tested against the game; where something is
+a guess, the page says so (*likely*, *unknown*). Development used the German CD; the English
+first release is supported too (see [game versions](reference/game-files.md#grooveexe-versions)). The project is not affiliated with Disney or
+Argonaut and contains no game data.
@@ -0,0 +1,108 @@
+# For developers
+
+How the code is organised, how to build and test it, and where the engineering notes are.
+
+## Build
+
+Requirements: a **JDK 25** installed (the Gradle toolchain compiles with it; there is no
+auto-download). Gradle itself and Spotless currently need to run on **Java 21**, e.g.
+`JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64 ./gradlew …` on Debian/Ubuntu.
+
+```bash
+./gradlew spotlessApply build       # compile, format, run the tests
+./gradlew fatJar                    # build/libs/llamamod-<ver>-all.jar
+java -jar build/libs/llamamod-*-all.jar            # launcher
+java -jar build/libs/llamamod-*-all.jar --editor   # the editor alone
+./gradlew packageLinux              # tar.gz with its own Java runtime
+./gradlew packageWindows            # zip with LlamaMod.exe + runtime (built on Linux)
+./gradlew packageAll                # both systems, full and launcher (no editor) edition
+```
+
+Details (jlink, launch4j, editions, version and build id): [notes/llamamod-app.md](../notes/llamamod-app.md#build).
+
+**Tests that need the game.** Golden and in-game-data tests read the CD folder given by
+`-Dllamamod.cd=<…/Setup/<lang>/Cd>` or the environment variable `LLAMAMOD_CD` (default:
+`~/.wine-lama/iso-dk/Setup/Eng/Cd`); if that folder does not exist they are skipped. Byte-exact round trips over all level WADs (WAD, TRAK, MAP, TEXT, strat code) are the
+safety net for every format change.
+
+## Code map
+
+Package root [`src/main/java/com/eliasmueller/llamamod/`](../src/main/java/com/eliasmueller/llamamod/):
+
+| Package | Content | Notes |
+|---|---|---|
+| `format` | WAD, TRAK, STPC, MAP, TEXT, collision, COR | [Reference](reference/README.md) |
+| `format.strat` | strat disassembler, assembler, script view, compiler | [Strats](strats/README.md), [notes/strat-language.md](../notes/strat-language.md) |
+| `format.stpcmerge` | importing object types between levels (code, models, textures, sounds, texts) | [notes/editor-cross-import.md](../notes/editor-cross-import.md) |
+| `levelbuild` | Java level builder (`LevelBuilder`, `LevelScript`) | [Levels from scripts](guide/levels-in-code.md) |
+| `mods` | mod framework (`Mod`, `ModContext`, `ModManager`, options) and the built-in mods | [notes/llamamod-app.md](../notes/llamamod-app.md#mods), `notes/mod-*.md` |
+| `exe` | patching `groove.exe`: PE image, code caves, a tiny x86 emitter | [notes/llamamod-app.md](../notes/llamamod-app.md#grooveexe-patches-and-code-caves-exeexeimage-exex86) |
+| `platform` | install from ISO/CD, data folder, config, registry, Wine/Windows launch | [notes/llamamod-app.md](../notes/llamamod-app.md) |
+| `save` | KSV save games, TestLevel chapters | [Game files](reference/game-files.md#save-games-ksv) |
+| `ui` | launcher window | |
+| `editor.model`, `editor.io` | scene model, commands/undo, project format, WAD import/build | [notes/editor-api.md](../notes/editor-api.md), [notes/editor-format.md](../notes/editor-format.md) |
+| `editor.render` | OpenGL viewport | [notes/editor-render.md](../notes/editor-render.md) |
+| `editor.ui` | editor shell and plugin API | [notes/editor-ui.md](../notes/editor-ui.md) |
+| `editor.tools.*` | editor plugins: geometry, objects, environment, textures, catalog (cross-world import), strats, playtest, gltf, help | `notes/editor-tools-*.md`, [notes/editor-playtest.md](../notes/editor-playtest.md) |
+
+## Writing a mod
+
+A mod implements [`Mod`](../src/main/java/com/eliasmueller/llamamod/mods/Mod.java): `id`, `name`,
+`description`, `category` (LEVELS, GAMEPLAY, VISUAL, CHEATS), `options()` and `apply(ModContext)`.
+`apply` reads files of the game as earlier mods left them (`ctx.read`) and writes replacements
+(`ctx.write`); `ctx.exe()` gives access to `groove.exe` for patches. Mods are registered in
+[`ModRegistry`](../src/main/java/com/eliasmueller/llamamod/mods/ModRegistry.java). LlamaMod caches
+mod outputs and never touches the original files.
+
+Good examples: [`mods/testworld/`](../src/main/java/com/eliasmueller/llamamod/mods/testworld/) (a
+level built in code), [`mods/arena/`](../src/main/java/com/eliasmueller/llamamod/mods/arena/) (level
+ new strat types, walkthrough: [Arena](strats/arena.md)),
+[`mods/fog/`](../src/main/java/com/eliasmueller/llamamod/mods/fog/) (data-only change of all levels),
+[`mods/practice/`](../src/main/java/com/eliasmueller/llamamod/mods/practice/) (exe code caves with
+hotkeys). Full API: [notes/llamamod-app.md](../notes/llamamod-app.md#writing-a-mod).
+
+Every mod should be checked in the running game; [`tools/apptest.py`](../tools/apptest.py) does
+this unattended on Linux ([Tools](tools.md#testing-in-the-game)).
+
+## The editor manual
+
+[`docs/manual/`](manual/index.md) is the editor's user manual **and** its built-in help: the build
+bundles the folder into the jar (`processResources` in `build.gradle`), the Help window renders it
+with its own small Markdown converter, and F1 maps editor topics to chapter anchors
+(`editor/tools/help/context-help.txt`). Rules for that folder:
+
+* Only the Markdown subset described at the top of `index.md`; every chapter must be linked from
+  `index.md`; links must stay **inside** `docs/manual` (the help window cannot open other files).
+* Blocks between `generated:NAME` comments (shortcuts, menus, mod reference) are rewritten from the
+  live program by `ManualTest` – do not edit them by hand.
+* `./gradlew test --tests '*ManualTest*'` checks links, anchors and images.
+
+Maintenance notes: [notes/editor-manual.md](../notes/editor-manual.md).
+
+## Engineering notes
+
+[`notes/`](../notes/README.md) is the project's lab notebook: one file per format, editor area and
+mod, with addresses in `groove.exe`, confidence levels, what was verified in the game and known
+limits. Process material (agent briefs, review reports) is in [`notes/dev/`](../notes/dev/).
+
+## Releasing
+
+Releases are built by Gitea Actions ([.gitea/workflows/release.yml](../.gitea/workflows/release.yml)):
+
+1. Add a `## <version> – …` section at the top of [CHANGELOG.md](../CHANGELOG.md) (it becomes the
+   release text; the workflow fails if it is missing).
+2. `git tag v<version> && git push origin v<version>`
+
+The workflow builds and tests (tests that need the game CD skip themselves on the runner), runs
+`packageAll` with `-PreleaseVersion=<version>` (the tag decides the version; without it
+`build.gradle`'s default is used), writes `SHA256SUMS.txt` and creates the release with the four
+packages via [tools/release/publish_gitea.py](../tools/release/publish_gitea.py) (standard library
+only; re-running replaces files of the same name). [.gitea/workflows/build.yml](../.gitea/workflows/build.yml)
+builds every push.
+
+Requirements on the Gitea side: Actions enabled (`[actions] ENABLED = true`), an `act_runner` with
+the label `ubuntu-latest` (an image with `python3`, `curl`/network access – the build downloads the
+Temurin JDK/jmods and launch4j), and an attachment size limit above ~60 MB (`[attachment] MAX_SIZE`
+in `app.ini`). If the built-in token may not create releases, add a repository secret
+`RELEASE_TOKEN` with write access. Locally the same packages come from
+`./gradlew -PreleaseVersion=<version> packageAll` (output in `build/dist`).
@@ -0,0 +1,126 @@
+# Build your own level
+
+A step-by-step path from "I have the game" to "my friends are playing my level". Each step is short
+and links to the chapter of the [editor manual](../manual/index.md) that has the details.
+The manual is also built into the editor: press **F1** over any panel, tool or dialog.
+
+| Step | |
+|---|---|
+| 1 | [Set up LlamaMod](#1-set-up-llamamod) |
+| 2 | [Learn the editor in ten minutes](#2-learn-the-editor-in-ten-minutes) |
+| 3 | [Plan the level](#3-plan-the-level) |
+| 4 | [Build the ground](#4-build-the-ground) |
+| 5 | [Start, checkpoints and the exit](#5-start-checkpoints-and-the-exit) |
+| 6 | [Objects, enemies and cameras](#6-objects-enemies-and-cameras) |
+| 7 | [Look and feel: textures, fog, music, light](#7-look-and-feel-textures-fog-music-light) |
+| 8 | [Play-test](#8-play-test) |
+| 9 | [Share it](#9-share-it) |
+| 10 | [Go further](#10-go-further) |
+
+Before you start, skim [Design rules](design-rules.md): the numbers (jump distances, draw
+distance) and the handful of rules that keep the game from crashing.
+
+![The level editor](../img/editor.jpg)
+
+## 1. Set up LlamaMod
+
+1. Get **your own copy** of the game: the CD or an ISO image of it (*The Emperor's New Groove* PC,
+   2000; German: *Ein Königreich für ein Lama*). LlamaMod contains no game files.
+2. Download the **full** package for Windows or Linux, unpack it and start `LlamaMod.exe` /
+   `./LlamaMod` (Linux needs Wine to run the game). Or build it from source – see the
+   [main README](../../README.md#build-from-source).
+3. The first-start wizard copies the game into LlamaMod's data folder. The original CD or ISO is
+   never changed.
+4. Click **Play** once to check that the unmodded game runs.
+
+Manual: [Installing LlamaMod and the first start](../manual/02-installing.md).
+
+## 2. Learn the editor in ten minutes
+
+Click **Level Editor** in LlamaMod and follow
+[Your first level in 10 minutes](../manual/tutorial-first-level.md): a new level from the
+*Island* template, a ramp, a coin trail, play it. Then read
+[Introduction and concepts](../manual/01-introduction.md) – tiles, brushes, objects, zones, base
+levels, chapters – and [Navigating the viewport](../manual/04-navigation.md).
+
+## 3. Plan the level
+
+* **New or edited?** A *new level* starts empty on a **base level** (default: Village 1) that
+  provides the object types, textures, sky, fog and music. *Editing an original level* changes the
+  real Village, River … in place ([tutorial](../manual/tutorial-original-level.md)).
+* **Choose the base by its objects.** Only the base's object types are available directly; more
+  can be imported from any world ([Importing objects](../manual/09-objects.md#importing-objects-from-other-worlds)).
+* **Size.** The village grid is 96 × 96 cells; the llama is 0.6 tall and jumps about 1.3 cells.
+  A small, dense level plays better than a big empty one – the draw distance is only 8–16 cells.
+* **Where it goes.** New levels live in the hidden world 9, *TestLevel*, on chapter 1 or 32–49
+  ([why](../reference/testlevel.md)). The editor picks a free chapter.
+
+## 4. Build the ground
+
+* **Brushes** (B) draw boxes, ramps, stairs, cylinders and more; they are cut into tiles when the
+  level is built ([Building geometry](../manual/06-geometry.md)).
+* **Tiles** (T) place the base level's own tile models for an original look.
+* **Meshes** from Blender or any 3D program come in as OBJ or glTF
+  ([Importing meshes](../manual/07-meshes.md), [Blender tutorial](../manual/tutorial-blender.md)).
+* **Collision** (K) decides what is solid: walls, floors, invisible walls, death floors, the exit
+  floor. The llama cannot step up even small edges – use slopes, or walls without collision.
+
+![A level exported as glTF and opened in Blender](../img/gltf-blender.jpg)
+
+## 5. Start, checkpoints and the exit
+
+Use the one-click setups in the Objects panel ([Objects](../manual/09-objects.md#one-click-setups)):
+
+* **Player start** – the llama plus its start camera node behind it. Keep the space behind the
+  llama free, or the camera jumps aside.
+* **Checkpoint** – where the llama respawns after a fall.
+* **Exit** – a LevelDoor *and* a floor with collision material 16 in the same grid cell. Without
+  that floor the exit does nothing ([why](../reference/objects.md#the-exit-leveldoor--certain)).
+  Its target is the next level; in TestLevel never "world finished" (7, 7, 7).
+* **Death plane** – a death floor below everything, so falling off respawns instead of falling
+  forever.
+
+## 6. Objects, enemies and cameras
+
+* Place coins with the **Coin tool** (O), anything else from **Assets → Objects**
+  ([Objects](../manual/09-objects.md)).
+* Enemies and moving things often need a **waypoint chain** – some guards even need a pair of
+  waypoint boxes and an event bit, or the game removes them. The Inspector and *Check for problems*
+  tell you ([Waypoints](../manual/10-waypoints.md)).
+* **Cameras**: camera zones, cut scenes and the start camera
+  ([Cameras and triggers](../manual/11-cameras-triggers.md)).
+* Change how an object behaves – a number in its script or a whole new type: see
+  [Strats](../strats/README.md) and [manual chapter 22](../manual/22-strats.md).
+
+## 7. Look and feel: textures, fog, music, light
+
+* **Textures**: the base's textures, imported PNG/JPG pictures, painting onto faces, flip-book
+  animations ([Textures](../manual/08-textures.md)).
+* **Environment zones** set fog (= draw distance), sky colour and **music**; teleport zones move
+  the player between areas ([Environment](../manual/12-environment.md),
+  [music ids](../reference/audio.md#music)).
+* **Light**: tiles get baked vertex colours (*Bake lighting*), lights only light objects.
+* **Visibility regions** hide areas the camera cannot see – needed for big levels
+  ([Visibility](../manual/13-visibility.md)).
+
+## 8. Play-test
+
+**F5** builds the level and starts the game directly in it; **Shift+F5** starts at the camera
+position. *Check for problems* (also run on every build) lists errors and warnings – double-click
+one to select the culprit. **Escape** in the game quits straight back to the editor.
+Manual: [Building, problems and play-testing](../manual/15-build-play.md).
+
+## 9. Share it
+
+**File → Save** writes a small `.llamalevel` project: only your changes, no game data. Send that
+file; the receiver copies it into LlamaMod's `levels` folder (or opens it in the editor and uses
+*Level → Add to LlamaMod…*), ticks it in the *Levels* category and clicks *Apply*. It is built from
+their own game copy. Manual: [Sharing levels](../manual/17-sharing.md).
+
+## 10. Go further
+
+* Build levels from code instead of the mouse: [Levels from scripts](levels-in-code.md).
+* Understand the data: [Reference](../reference/README.md).
+* Write object behaviour: [Strats](../strats/README.md) and the
+  [Alligator Arena walkthrough](../strats/arena.md).
+* All tools at a glance: [Tools](../tools.md).
@@ -0,0 +1,48 @@
+# Design rules
+
+The numbers and rules that matter when you design a level for this engine. Background and sources:
+[Engine facts and limits](../reference/engine-limits.md).
+
+## Sizes to design with
+
+| | |
+|---|---|
+| one grid cell | 1 unit |
+| llama | 0.6 tall, walks 1.1 units/s |
+| jump up | ≤ 0.35 (0.5 fails) |
+| jump across, with a run-up | ~1.3 (from standing much less) |
+| easy parkour | gaps 0.3 with +0.2 height, platforms ≥ 1.5 long |
+| steps without jumping | none – use slopes or walls without collision |
+| draw distance | the fog end of the zone: 8–16 cells in the originals |
+| objects visible | within ~12.5 units of the llama |
+
+![The Test World's gallery: every figure of the game on a pedestal](../img/testworld-gallery.jpg)
+
+## Rules that keep the level working
+
+1. **One player start**, with nothing solid right behind the llama (start camera).
+2. **Exit = LevelDoor + floor with collision material 16 in the same cell.** Target (1, 9,
+   chapter) in TestLevel – never (7, 7, 7).
+3. **A death floor or death plane** under every place the llama can fall to.
+4. **A checkpoint** before every hard part.
+5. **TestLevel chapter 1 or 32–49** for new levels.
+6. **Guards and box walkers need their waypoint boxes** (and guards an event bit someone sets),
+   or the game removes them.
+7. **Every area must be visible from where the camera is**: with visibility regions, check the
+   masks (*Check for problems* reports regions nothing can see).
+8. **Stay within the budget**: 16 MB level memory, 127 texture pages, 128 sounds – the import
+   preview and *Check for problems* show where you are.
+
+The editor and both level builders enforce the data-level rules (tiles inside the grid, vertex
+colours, type fields, collision cells) automatically. *Check for problems* reports the rest.
+
+## Good habits
+
+* **Play-test often** (F5). The engine is unforgiving and a small change can stop the exit or
+  hide an area.
+* **Look at the originals.** Open an original level in the editor and see how it builds doors,
+  cameras and enemy paths; the [debug view mod](../tools.md#debug-view) shows collision and
+  invisible objects in the running game.
+* **Keep levels compact.** Short sight lines hide the draw distance and keep the frame rate up.
+* **Copy numbers** (speeds, parameters, waypoint fields) from original objects that already do
+  what you want.
@@ -0,0 +1,97 @@
+# Levels from scripts
+
+Besides the editor, a level can be described as a short script that a **level builder** turns
+into a complete WAD: geometry made of boxes, ramps, stairs, trees and sea, objects placed by type
+name, lighting baked automatically. There are two builders with the same ideas:
+
+| Builder | Language | Used by |
+|---|---|---|
+| [`tools/levelbuild.py`](../../tools/levelbuild.py) | Python 3 (numpy, Pillow) | the original test world [`levels/testwelt.py`](../../levels/testwelt.py), the jump lab [`levels/sprunglabor.py`](../../levels/sprunglabor.py) |
+| [`levelbuild/LevelBuilder.java`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelBuilder.java) | Java (`LevelScript`) | the Test World mod ([`mods/testworld/`](../../src/main/java/com/eliasmueller/llamamod/mods/testworld/)), the [Alligator Arena](../strats/arena.md), the editor's brushes |
+
+Both start from a **base level** (default Village 1): its object code, textures and sound are
+kept; geometry, tile grid, vertex colours, objects and waypoints are generated from scratch. Full
+documentation of the Python builder, the measured physics and the test world:
+[notes/levelbau.md](../../notes/levelbau.md).
+
+## A Python level
+
+```python
+LEVEL_ARGS = dict(name='MyLevel', seed=7)
+
+def build(L):
+    L.sea(0, 0, 60, 60, y=-2.0, kill=(6, 4, 54, 56))          # sea + death plane
+    L.box(14, 12, 26, 24, -0.4, 0, top='stein', side='stein')  # a stone plaza
+    L.stairs(26, 18, 29, 22, 0, 1.5, 3, '+x')                  # stairs up to the east
+    L.box(29, 17, 33, 23, 0, 1.5, top='gras', side='erde')
+    L.player(20, 14.5, rot=0)                                   # facing +z
+    L.checkpoint(17, 18.5)
+    L.coins([(27, 20), (28, 20)])
+    L.strat('Bunny', 31, 20)
+    L.box(31, 21, 32, 22, 1.5, 1.56, top='platte', side='stein', mat=16)  # exit floor
+    L.exit(31.5, 21.5)                                          # LevelDoor in the same cell
+```
+
+```bash
+python3 tools/levelbuild.py my_level.py out/my_level.wad      # build
+python3 tools/levelbuild.py --types                           # object types of the base
+python3 tools/levelbuild.py --textures tex.png                # texture names and a contact sheet
+```
+
+Coordinates are game units: x east, y up, z = grid row ("south"); angles in degrees, 0° faces +z.
+Building blocks: `floor`, `box`, `platform`, `pillar`, `ramp`, `stairs`, `fence`, `tree`, `sea`,
+`quad`, `collider`, `obj` (an OBJ file), `height_at`. The exit needs a floor with collision
+material 16 in its cell – the test world uses `box(..., mat=16)` under the door.
+
+**Texture names**: the Python builder's own names are German (`gras`, `stein`, `erde`, `platte`,
+`meer` …, list: `--textures`); the English names of the Java builder (`grass`, `stone`, `earth`,
+`slab`, `sea` …) work as well and give the same result.
+
+The base level is `t1l1m001.wad` in the CD folder `$LLAMAMOD_CD/wads` (default
+`~/.wine-lama/iso-dk/Setup/Eng/Cd`), or `--base <file>`. `--install` copies the WAD into the TestLevel
+mod of a hand-made Wine setup (`$LAMA_WINEPREFIX/mods/testlevel`, default `~/.wine-lama`) – with
+LlamaMod, use a Java level or the editor instead. All variables: [Tools: Paths](../tools.md#paths).
+
+## A Java level
+
+Implement [`LevelScript`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelScript.java):
+
+```java
+public final class MyLevel implements LevelScript {
+    @Override public String levelName() { return "My Level"; }
+
+    @Override public void build(LevelBuilder l) {
+        l.sea(0, 0, 40, 40, -1.5, new double[] {7, 7, 33, 33});
+        l.floor(10, 10, 30, 30, 0, "grass");
+        l.box(18, 24, 22, 25, 0, 0.06, o().top("pattern_purple").mat(16));   // exit floor
+        l.player(20, 12, 0);
+        l.checkpoint(12, 12);
+        l.exit(20.5, 24.5, null, null, new int[] {1, 9, 32});
+        l.coins(List.of(new double[] {20, 16}, new double[] {20, 18}));
+    }
+}
+```
+
+`buildWad(baseWad, wads, opts)` returns the WAD. To ship it, write a small
+[mod](../developers.md#writing-a-mod) whose `apply` writes `wads/T1L9M0nn.wad` (chapter 1 or
+32–49) and a loading picture – [`ArenaMod`](../../src/main/java/com/eliasmueller/llamamod/mods/arena/ArenaMod.java)
+is a complete example. Texture names are English here (`grass`, `stone`, `sand`, `inca`, …) and are
+matched by picture on the chosen base.
+
+## The editor from the command line
+
+The editor's project format can be scripted too:
+
+```bash
+llamamod --editor-new my.llamalevel t1l1m001 --name "My level"     # new project on a base
+llamamod --editor-import t1l2m001 jungle.llamalevel                # an original level as a project
+llamamod --editor-build my.llamalevel out.wad                      # build the WAD
+llamamod --import-level my.llamalevel                              # install as a level mod
+```
+
+## Seeing the result without the game
+
+* [`tools/geom_export.py`](../../tools/geom_export.py) `level.wad outdir --collision --objects`
+  writes OBJ files, texture pages and two preview images.
+* [`tools/vorschau/`](../../tools/vorschau/) renders labelled overviews with Blender (Eevee).
+* In the game: the test harness, see [Tools](../tools.md#testing-in-the-game).
@@ -76,7 +76,7 @@ created. Object types of other levels can be added later with **Assets → All w

 The game has eight worlds – **Village, Jungle at Night, River, Jungle by Day, Mountain, City,
 Catacombs, Lab** – each with several chapters. A ninth, hidden world called **TestLevel** has 49
-empty chapter slots. New levels go into one of these TestLevel chapters, so they never replace an
+empty chapter slots; 19 of them (1 and 32–49) are safe to use. New levels go into one of these TestLevel chapters, so they never replace an
 original level: each project gets its own chapter (shown in the New level dialog and in
 [Level settings](14-level-settings.md)). In the game they appear on the world-9 map as
 "TestLevel – chapter *n*".
@@ -98,7 +98,7 @@ and press **Play** to play the level – or press **F5** in the editor. See

 ## What you need

-* The PC game (CD or ISO image; developed with the German version).
+* The PC game (CD or ISO image): the German or the English version (see [FAQ](20-troubleshooting.md#faq)).
 * LlamaMod – see [Installing LlamaMod](02-installing.md).
 * A graphics card with **OpenGL 3.3** for the editor's 3D view.
 * On Linux, Wine to run the game (LlamaMod sets it up).
@@ -1,7 +1,7 @@
 # Installing LlamaMod and the first start

 LlamaMod runs on **Windows** and **Linux**. It needs your own copy of the game – the CD or an ISO
-image of it. The game itself does not have to be installed: LlamaMod copies what it needs into
+image of it, German or English version. The game itself does not have to be installed: LlamaMod copies what it needs into
 its own data folder and never changes the original.

 ## Download and start
@@ -29,7 +29,7 @@ list of recent projects.
 | **Level name** | The name LlamaMod and the loading picture show. |
 | **Author** | Your name (remembered for the next level). |
 | **Base level** | The original level that provides object types, textures, sky, fog and music, shown with its loading picture. Default: Village – Chapter 1. See [Base levels](01-introduction.md#base-levels). |
-| **TestLevel chapter** | The chapter of world 9 (TestLevel) the level replaces when it is enabled. The next free chapter is suggested. |
+| **TestLevel chapter** | The chapter of world 9 (TestLevel, 32–49 or 1) the level replaces when it is enabled. The next free chapter is suggested. |
 | **Start with** | **Empty** (nothing but the base level's sky, fog and music), **Flat floor** (a 16×14 grass floor, player start and an exit) or **Island** (a grass island with trees in the sea, player start and an exit). |

 Every new level starts clean: of the base level it keeps only the **start zone** (its fog, colours
@@ -87,7 +87,7 @@ toggle snapping for this drag. **Shift+click** selects an existing brush without

 The options section in the Inspector changes with the primitive. Textures are chosen with a
 swatch button: click it for a searchable grid of all textures of the level (names are the
-village texture names; `#n` is texture number *n* of the base level, see
+village texture names the base level has; `#n` is texture number *n* of the base level, see
 [Textures](08-textures.md)). **none** leaves that part out.

 | Option | Primitives | Meaning |
@@ -10,8 +10,10 @@ paint them onto faces.
 * A level has up to **127 pages**. Each page has one *blend class* (opaque, cut-out,
  semi-transparent …); every texture on it should have the same class.
 * Textures are numbered: `#221` is texture 221 of the level. In brush texture fields you can type
-  `#221` or a name. The names (`grass`, `stone`, `bark` …) are those of the village textures;
-  other base levels mostly use numbers.
+  `#221` or a name. The names (`grass`, `stone`, `bark` …) are those of the village textures.
+  On another base level a name means the same picture wherever that level has it (Village 2 and 3
+  have most of them); names the base level does not have are left out of the texture grid, and a
+  brush that uses one is skipped with a warning.
 * Brushes can also use flat colours (colour names, or `rgbRRGGBB`).
 * The game shows textures in **15-bit colour** (5 bits per channel) with 1 bit of transparency,
  so gradients get coarser and soft edges become hard.
@@ -113,7 +113,7 @@ Colour pickers update the viewport live while you pick; the whole pick is one un

 | Field | Meaning |
 |---|---|
-| **Music** | Track started when the zone becomes active (`music/<name>.ASF`): VILLAGE, JUNGLE1, RIVER, CITY, CATACOMB, LAB, BALLOON, KRONK, VICTORY … *0 – (none)* stops the music. |
+| **Music** | Track started when the zone becomes active (`music/<name>.ASF`): VILLAGE, JUNGLE1, RIVER, CITY, CATACOMB, LAB, BALLOON, KRONK, VICTORY … *0 – (none)* stops the music. Tracks marked *(no file on the CD)* have no music file (on the German CD) – pick another one. |
 | **Sky model** | The object model drawn as the sky dome (one of the sky models used in this level), or none. |
 | **Sky yaw** | Turns the sky dome. |

@@ -25,7 +25,7 @@ nothing.
 | **Description** | A few sentences for the mod list. |
 | **Project** | *new level* or *changes to an original level* (read only). |
 | **Base level** | The original level the project is built on – it provides the object code, textures, sounds, sky and music (read only). |
-| **TestLevel chapter** | New levels only: the chapter of world 9 (TestLevel, 1–49) the level replaces when its mod is on. |
+| **TestLevel chapter** | New levels only: the chapter of world 9 (TestLevel: 32–49, or 1) the level replaces when its mod is on. Chapters 2–31 are not offered: the game would store this level's coins over other game data. |

 Below the chapter field the dialog lists which chapters other level projects in your `levels`
 folder already use, so you can pick a free one. Each level needs its own chapter; chapter 1 is
@@ -39,14 +39,17 @@ Then tick the level in LlamaMod, click **Apply** and **▶ Play**. To get rid of

 ## Chapters and conflicts

-Each new level occupies one of the 49 TestLevel chapters. The editor picks a free chapter for
+Each new level occupies one of the TestLevel chapters **32–49** (or chapter 1). The editor picks a free chapter for
 new projects, but levels from different people may use the same one. If two active level mods
 use the same chapter – or two mods change the same original level – LlamaMod stops applying and
 names the files involved. Fix it in the mod's options: every new-level mod has a
-**TestLevel chapter** option (1–49).
+**TestLevel chapter** option (1, 32–49).

-> **Note:** Chapter 1 of the TestLevel is also used by the built-in **Test World** mod. Prefer
-> chapters 2 and above for your own levels.
+> **Note:** Chapter 1 of the TestLevel is also used by the built-in **Test World** mod. The game
+> keeps coins and flags for chapters 2–31 of world 9 in memory that belongs to other things (your
+> progress, the text language …), so LlamaMod does not use them: levels saved with such a chapter
+> by an older version move to a free chapter from 32 on. With more than 18 new levels, some share a
+> chapter – only one of them can be on at a time.

 ## Updating a shared level

@@ -38,7 +38,7 @@ option:

 | Option | Values | Meaning |
 |---|---|---|
-| TestLevel chapter | 1 – 49 | the chapter of world 9 the level occupies; each level needs its own (chapter 1 is also used by the Test World mod) |
+| TestLevel chapter | 1, 32 – 49 | the chapter of world 9 the level occupies; each level needs its own (chapter 1 is also used by the Test World mod). Other chapters would overwrite game data such as your progress, so older levels on chapters 2–31 move to a free one of 32–49 |

 Edited original levels have no options – they replace their chapter. See
 [Sharing levels](17-sharing.md).
@@ -61,7 +61,7 @@ not want with **Remove…**.

 ## The Alligator Arena minigame

-The **Alligator Arena** mod (Levels) puts a small minigame on a TestLevel chapter (default 8):
+The **Alligator Arena** mod (Levels) puts a small minigame on a TestLevel chapter (32–49, default 49):
 a walled sand pit where alligators come in waves (wave 1: one, then two at a time). Face an
 alligator and **kick** (Action) or **jump and press Action in the air** (the llama dives onto
 it). Every hit costs it one life: it blinks, backs off and coins pop out – they count on the
@@ -74,6 +74,21 @@ another mod on the same chapter stops the apply with a message – pick another

 ![Alligator Arena: two alligators, coins popping out](img/mod_arena.jpg)

+## The Llama Coaster ride
+
+The **Llama Coaster** mod (Levels) puts a roller-coaster ride on a TestLevel chapter (32–49,
+default 48). You ride the cart from the Catacombs coaster levels: it leaves the station by itself,
+races down drops and up climbs, speeds up on the boost arrows, jumps over a gap and turns round on
+the spin pad. Press **Left** and **Right** to move the cart across the track and collect the
+coins. After the last lap the cart stops at the station, fireworks go off and the tally appears;
+**Enter** rides again, and *Beenden und zur Auswahlkarte wechseln* in the Esc menu goes back to the
+map. The options pick the track (*Loop* or the longer *Grand circuit*), the laps (1–3), the speed
+and whether there are coins. Unlock TestLevel on the **Save games** tab and pick the chapter on the
+world-9 map. A level project or another mod on the same chapter stops the apply with a message –
+pick another chapter then.
+
+![Llama Coaster: boost arrows on the Grand circuit](img/mod_coaster.jpg)
+
 ## Command line

 LlamaMod can be scripted:
@@ -107,7 +122,21 @@ A minigame on a TestLevel chapter: alligators come in waves into a walled pit. E
 | Waves | 1 – 5 | 3 | Wave n brings n alligators (at most 2 at once). |
 | Llama energy | 1 – 5 | 4 | Energy cap of the llama in the arena (5 = normal). |
 | Coins per hit | 0 – 5 | 1 | Coins that pop out per hit (5 more at the end). |
-| TestLevel chapter | 2 – 8 | 8 | Chapter of world 9 the arena replaces. |
+| TestLevel chapter | 32 – 49 | 49 | Chapter of world 9 the arena replaces (32–49; chapter 1 is the Test World's). |
+
+#### Llama Coaster
+
+A roller coaster ride on a TestLevel chapter, with the cart from the Catacombs coaster levels: drops, climbs, boost arrows, a spin pad that turns the cart backwards and a jump over a gap. Steer left and right to stay on the track and collect coins; the ride ends at the station. Unlock TestLevel on the Save games tab.
+
+*Id* `coaster`
+
+| Option | Values | Default | Description |
+|---|---|---|---|
+| Track | Loop, Grand circuit | Loop | Short loop (about 100 units) or the grand circuit (about 150 units, two jumps, two spins). |
+| Laps | 1 – 3 | 2 | Laps before the ride stops at the station. |
+| Speed | Slow, Normal (as in the game), Fast | Normal (as in the game) | Cruise speed and boost strength of the cart. |
+| Coins | on / off | on | Coins along the track. |
+| TestLevel chapter | 32 – 49 | 48 | Chapter of world 9 the coaster replaces (32–49; chapter 1 is the Test World's, 49 the arena's). |

 #### Test World

@@ -115,6 +144,12 @@ Turns the hidden TestLevel (world 9, chapter 1) into a playground island: a gall

 *Id* `testworld`

+#### Village Chapter 1 (play-test)
+
+Temporary play-test copy from the level editor – removed when the play-test ends. Changes the original level t1l1m001.
+
+*Id* `playtest-village-chapter-1`
+
 ### Gameplay mods

 #### Boot to level
@@ -212,7 +247,7 @@ Switches on the game's secret cheat codes for you, so you don't have to type the
 | Complete chapter rewards | on / off | off | Finishing a chapter also gives you its collectible and gold coin (code → → ↓ ↓ ↓ ↑ ↓ ↓). |
 | Start with 500 fruit | on / off | off | The purple fruit counter starts at 500 in every chapter (code ↑ ↓ → ← ← ← ← ↓). |
 | Full charge meter | on / off | off | The charge bar starts full in every chapter (code ↑ ← ↓ → ↓ ↓ ↑ ↑). |
-| Write display diagnostics | on / off | off | For graphics problems: the game writes a report of your graphics devices (<computer name>.dispdiag) into the game folder. Same as its hidden -display_diagnostics switch. |
+| Troubleshooting: write display diagnostics | on / off | off | Only for troubleshooting when asked to. At start the game switches through every screen mode of every monitor – all screens go black for a while (30 s or more) – and writes a report (<computer name>.dispdiag) into the game folder, then starts normally. Same as its hidden -display_diagnostics switch. |

 #### Debug wireframe

@@ -11,6 +11,7 @@
 | "Not enough free disk space" | The game copy needs about 900 MB. Free up space or choose another **Data folder**. |
 | The game hangs or its window is gone | Click **■ Quit game** in LlamaMod (the Play button while the game runs). |
 | "The game crashed" | Switch off the mods you turned on last, or click **Restore original**, and play again. If the original game crashes too, report it with `game.log` (**Settings → Logs**). |
+| All monitors flash black for half a minute or more when the game starts | The **Built-in cheats** option *Troubleshooting: write display diagnostics* is on. It makes the game try every screen mode of every monitor before it starts. Switch it off; use it only when you are asked for a display report. |
 | "groove.exe was removed or changed" | Click **Rebuild**; LlamaMod writes it again and then starts the game. On Windows, see [Antivirus warnings](#antivirus-warnings). |

 ## The editor
@@ -101,9 +102,13 @@ after an update, **Settings → Clear cache** throws it away; active mods are re

 ## FAQ

-**Do I need the German version of the game?**
-The tools were developed with the German CD. Other language versions use the same engine and
-should work; if one does not, please report it.
+**Which versions of the game work?**
+The German CD (`groove.exe` of 2001-02-12) and the English first release (2000-10-17) are
+supported, including every mod. With another version LlamaMod shows a warning at start and before
+the first Apply (nothing is blocked); the level mods still work, but the mods
+marked *modifies groove.exe* stop with "unknown program version" – the first lines of
+`logs/apply.log` name the version LlamaMod found. Please report it together with that
+`groove.exe`, then it can be added.

 **Can I share levels with people who do not have the game?**
 No – levels are built from the receiver's own game copy. That is also what makes sharing legal:
@@ -40,8 +40,9 @@ Every change can be undone with **Ctrl+Z**.

 ## Step 4: A coin trail

-1. Open the **Objects** panel (left) and click **Coin line** under the quick setups – or press
-   **O** for the **Coin line / arc** tool.
+1. Open the **Objects** tab in the left dock – the ⊙ icon right next to *Outliner* (inactive tabs show only
+   their icon) and click **Coin line** under **Quick setups** – or press **O** for the
+   **Coin line / arc** tool.
 2. Click once at the start of the trail and once at its end. Coins appear every *spacing* cells
   on the ground (also up the ramp).

@@ -32,7 +32,8 @@ Every drag is one undo step – **Ctrl+Z** takes it back.

 ## Step 3: Add a checkpoint

-1. Open the **Objects** panel (left dock) and click the quick setup **Checkpoint**.
+1. Open the **Objects** tab in the left dock – the ⊙ icon right next to *Outliner* (inactive tabs show only
+   their icon) and click the quick setup **Checkpoint**.
 2. The Place tool (**P**) is now active. Click on the ground where the checkpoint should stand.

 The editor places a checkpoint post together with its respawn point a little in front of it.
@@ -50,7 +51,7 @@ The start of the level uses the **start zone**:
 4. In the Inspector, click **Fog / sky colour** and choose a new colour – for example a soft
   orange for an evening mood. The viewport follows while you pick.
 5. Lower **End (Max)** a little for a denser fog.
-6. Under **Music & sky**, choose another **Music** track, for example `PUZZLE2`.
+6. Under **Music & sky**, choose another **Music** track, for example `22 – KRONK`.

 The village houses have their own zones (one per door), so the inside of a house keeps its
 original fog. See [Environment](12-environment.md) for every field.
@@ -69,7 +69,8 @@ plane shows as material 30. Look for:

 The llama should not have to start over after every fall.

-1. Open the **Objects** panel (left dock) and click **Checkpoint** in **Quick setups**.
+1. Open the **Objects** tab in the left dock – the ⊙ icon right next to *Outliner* (inactive tabs show only
+   their icon) and click **Checkpoint** in **Quick setups**.
 2. Click on a platform in the middle of the course.

 You get a checkpoint post with its respawn point just in front of it. Falling after passing it
@@ -0,0 +1,56 @@
+# Reference: game files and engine
+
+Everything we know about the data of *The Emperor's New Groove* (PC, 2000; German: *Ein Königreich
+für ein Lama*), found by reverse engineering `groove.exe` and checking every claim against the
+level files on the CD and in the running game. The game runs on Argonaut's **Croc 2 engine** (a PC
+port of a PlayStation design), which explains most of its quirks.
+
+Confidence is marked where it matters: **certain** = verified in code and data (byte-exact round
+trip or seen in game), **likely** = consistent with the data, **unknown** = open question.
+
+| Page | What it covers |
+|---|---|
+| [Game files](game-files.md) | CD and HD folders, level naming scheme, worlds and chapters, loading pictures (COR), movies, demos, save games (KSV) |
+| [WAD container](wad.md) | the chunk list of a level file and which chunk does what |
+| [Geometry and collision](geometry.md) | TRAK tile models, the MAP tile grid, coordinate spaces, collision polygons and materials, vertex colours, visibility regions |
+| [Objects, waypoints, zones](objects.md) | MAP strat records, parameters, waypoints, environment zones (fog, music, teleports), lights, the player start, checkpoints and the exit |
+| [Textures](textures.md) | TEXT chunk: pages, pixel format, texture rectangles, texture animations |
+| [Music and sound](audio.md) | ASF music, the level sound bank, speech, what is still unknown |
+| [TestLevel (world 9)](testlevel.md) | the hidden world all custom levels live in, and which chapters are safe |
+| [Engine facts and limits](engine-limits.md) | scale, jump distances, draw distance, memory budget, things that crash the game |
+
+How objects *behave* (the strat bytecode) has its own section: [Strats](../strats/README.md).
+
+## Where the details live
+
+These pages are the readable summary. The full lab notes – with every address in `groove.exe`,
+open questions and the history of each finding – are in [`notes/`](../../notes/README.md):
+
+| Topic | Lab notes |
+|---|---|
+| geometry, collision, coordinate spaces | [notes/geometry.md](../../notes/geometry.md) |
+| MAP layout, strat records, other chunks | [notes/objects.md](../../notes/objects.md) |
+| textures | [notes/textures.md](../../notes/textures.md) |
+| every object type in every level | [notes/strat_types_table.md](../../notes/strat_types_table.md) |
+| object parameters | [notes/editor-object-schemas.md](../../notes/editor-object-schemas.md) |
+| world 9 chapters | [notes/testlevel-chapters.md](../../notes/testlevel-chapters.md) |
+| level building, physics measurements, the exit | [notes/levelbau.md](../../notes/levelbau.md) |
+| fog, lights, regions | [notes/editor-tools-environment.md](../../notes/editor-tools-environment.md), [notes/mod-fog.md](../../notes/mod-fog.md) |
+| importing objects across levels | [notes/editor-cross-import.md](../../notes/editor-cross-import.md) |
+
+## Code that reads and writes these formats
+
+Every parser rebuilds all original files byte for byte, so the code is a reliable executable
+specification.
+
+| Format | Java (LlamaMod) | Python (kit) |
+|---|---|---|
+| WAD container | [`format/Wad.java`](../../src/main/java/com/eliasmueller/llamamod/format/Wad.java) | [`tools/wadtool.py`](../../tools/wadtool.py) |
+| TRAK / STPC models, collision | [`format/Trak.java`](../../src/main/java/com/eliasmueller/llamamod/format/Trak.java), [`Model.java`](../../src/main/java/com/eliasmueller/llamamod/format/Model.java), [`Collision.java`](../../src/main/java/com/eliasmueller/llamamod/format/Collision.java), [`Stpc.java`](../../src/main/java/com/eliasmueller/llamamod/format/Stpc.java) | [`tools/geomlib.py`](../../tools/geomlib.py) |
+| MAP | [`format/MapChunk.java`](../../src/main/java/com/eliasmueller/llamamod/format/MapChunk.java) | [`tools/mapchunk.py`](../../tools/mapchunk.py) |
+| TEXT | [`format/TextChunk.java`](../../src/main/java/com/eliasmueller/llamamod/format/TextChunk.java) | [`tools/textchunk.py`](../../tools/textchunk.py) |
+| whole level | [`format/Level.java`](../../src/main/java/com/eliasmueller/llamamod/format/Level.java) | – |
+| strat code | [`format/strat/`](../../src/main/java/com/eliasmueller/llamamod/format/strat/), [`format/stpcmerge/`](../../src/main/java/com/eliasmueller/llamamod/format/stpcmerge/) | [`tools/strats.py`](../../tools/strats.py), [`tools/stpcwalk.py`](../../tools/stpcwalk.py) |
+| COR pictures | [`format/CorImage.java`](../../src/main/java/com/eliasmueller/llamamod/format/CorImage.java), [`CorEncoder.java`](../../src/main/java/com/eliasmueller/llamamod/format/CorEncoder.java) | [`tools/cor2png.py`](../../tools/cor2png.py), [`tools/png2cor.py`](../../tools/png2cor.py) |
+| KSV saves | [`save/Ksv.java`](../../src/main/java/com/eliasmueller/llamamod/save/Ksv.java) | – |
+| ASF music | – | [`tools/asf2wav.py`](../../tools/asf2wav.py) (decode only) |
@@ -0,0 +1,73 @@
+# Music and sound
+
+Sound is the least explored part of the game. This page separates what is verified from what is
+only a guess. Custom music or sound effects are **not supported yet** by any LlamaMod tool.
+
+## Music
+
+| Fact | Status |
+|---|---|
+| Music tracks are files `music/<NAME>.asf` on the CD (33 files) | certain |
+| A level does not reference music files directly: **environment zones** carry a music id, and the start zone's id plays when the level begins | certain |
+| Music ids map to names through a table in `groove.exe` at 0x578960 (20 bytes per entry, name pointer at +8), played by `FUN_00546b70`; id 0 stops the music | certain |
+| ASF here is Argonaut's own format (not Microsoft ASF): 4-bit ADPCM, 44.1 kHz stereo, 17-byte blocks, decoded by `asfcodec.adl` in the game folder | certain (decoder reimplemented) |
+| A second zone field (u16 at +0x56) is probably the ambience setting | likely |
+
+The id table, as used by the editor's zone inspector
+([`EnvMath.MUSIC`](../../src/main/java/com/eliasmueller/llamamod/editor/tools/environment/EnvMath.java)):
+
+| Id | Track | Id | Track | Id | Track | Id | Track |
+|---|---|---|---|---|---|---|---|
+| 0 | (stop) | 10 | GAMEOVER | 20 | SNKJUNG | 30 | TUNE1 |
+| 1 | VILLAGE | 11 | TALLY | 21 | FROG | 31 | CHACHA |
+| 2 | JUNGLE1 | 12 | TURRACE | 22 | KRONK | 32 | JJUNGLE2 |
+| 3 | RIVER | 13 | PACHASNK | 23 | KIDLLAMA | 33 | TUNE9 |
+| 4 | JUNGLE2 | 14 | MOUNT2 | 24 | TUNE8 | 34 | TUNE6 |
+| 5 | MOUNTAIN | 15 | BALLOON | 25 | ROLLER | 35 | VICTORY |
+| 6 | CITY | 16 | JUNGSPID | 26 | BUNNY | 36 | PUZZLE2 |
+| 7 | CATACOMB | 17 | JAGCHASE | 27 | BLOCK | 37 | PLATFORM |
+| 8 | LAB | 18 | RIVER | 28 | TUNE5 | 38 | (none) |
+| 9 | TITLE | 19 | RIVRACE | 29 | CITYPUZZ | 39 | ENDGAME |
+
+Four names (GAMEOVER, TALLY, PUZZLE2, PLATFORM) have no `.asf` file on the German CD; what the
+game plays for them (probably nothing) was not checked. The editor marks them *(no file on the CD)*.
+
+**Changing the music of a level** works today: pick another id for the start zone (or any zone)
+in the editor's *Environment* panel ([manual: Environment](../manual/12-environment.md),
+[tutorial: Edit an original level](../manual/tutorial-original-level.md)).
+
+**Listening to the tracks:** [`tools/asf2wav.py`](../../tools/asf2wav.py) `in.asf out.wav`
+decodes a track exactly like the game's codec (filter 0: `s = s1 + (n << shift)`, filter 1:
+`s = 2·s1 − s2 + (n << shift)`, 16-bit wrap-around instead of clipping – FFmpeg's decoder clips and
+drifts).
+
+**New music – open:** there is no encoder yet. Writing one (the inverse of `asf2wav.py`) and
+replacing a track file through a mod would be the natural next step; the header fields after the
+block count (`rate`, `flags` with bit 1 = stereo) are read by the decoder, the others are *unknown*.
+
+## Sound effects
+
+| Fact | Status |
+|---|---|
+| Each level has its own sample bank, chunk **SMPC**: `u32 n`, n × `{u32 "cvg " tag, u32 length, data}` | certain ([`SoundMerge.java`](../../src/main/java/com/eliasmueller/llamamod/format/stpcmerge/SoundMerge.java)) |
+| Strats play samples by index (`soundPlay(sound:N)`, opcodes 0xd5 / 0x99 / 0x131 play, stop, is-playing); at most **128** samples per level, ids with bit 0x80 are the front-end sounds | certain |
+| The samples are PlayStation-style VAG ADPCM, decoded by `Vagcodec.adl` | likely (tag and codec name; the sample header was not decoded) |
+| **AMPC** holds ambient sound data (`ambi` / `VABp` blocks) | likely, not decoded |
+| `FESOUND.WAD` is the front-end sound bank (not a chunk file) | likely |
+
+Samples can be **moved between levels**: the editor's cross-world import and the arena copy the
+samples an imported object needs into the target level and renumber the `sound:N` operands
+([notes/editor-cross-import.md](../../notes/editor-cross-import.md)). Changing which sample an
+object plays is a constant edit in its script ([Strats](../strats/custom-types.md)). Exporting or
+replacing a sample's audio is not possible yet.
+
+## Speech and dialogue
+
+* **LGPC** holds the dialogue texts of a level in all languages plus a speech slot per line.
+* A speech slot `#<hex>` is an index into **SRPC**, whose entries are offset/size pairs into the
+  global speech file `music/<language>.cvs` in the game folder (the German version ships
+  `english.cvs`).
+* Strats show texts with opcodes 0xf0 / 0xfa (`topSay text:N`). Imported objects bring their
+  texts and speech references along.
+
+The CVS file format itself was not analysed.
@@ -0,0 +1,67 @@
+# Engine facts and limits
+
+Numbers to design levels with, and the things that crash the game. Measured in the game with the
+test harness unless noted.
+
+## Scale and movement
+
+One unit = one grid cell. Measured with the jump lab ([`levels/sprunglabor.py`](../../levels/sprunglabor.py))
+and a coin measuring track ([notes/levelbau.md](../../notes/levelbau.md#findings-from-the-game-tests-lamatest-xvfb)):
+
+| Quantity | Value |
+|---|---|
+| llama height | about 0.6 |
+| walking speed | about 1.1 units/s (≈ 1 s to accelerate) |
+| highest edge a jump clears | 0.35 (0.5 is too high) |
+| long jump with a run-up | about 1.3 units (from standing: much shorter, a 0.5 gap fails) |
+| comfortable parkour | gaps of 0.3 with +0.2 height, platforms ≥ 1.5 long |
+| step-up without jumping | none – any edge with wall collision blocks; use slopes or walls without collision |
+| frame rate of the logic | 30 frames per second (script speeds are per frame) |
+
+Controls are **camera-relative**; the start camera sits behind the llama and moves aside if
+something solid is right behind it – keep the area behind start points clear.
+
+## Drawing
+
+| Fact | Value |
+|---|---|
+| draw distance | = **fog end** of the active environment zone; originals 7–16 cells at detail *Maximum* (roller coaster up to 23), about half at *Minimum* |
+| objects | drawn only within about **12.5 units of the llama** (they keep running); their activity radius also follows the fog end |
+| hidden areas | visibility regions: a cell is drawn only if the camera region's mask contains its region |
+| texture coordinates | none per vertex – every triangle shows half of a texture rectangle |
+| lights | light only object models; tiles use baked vertex colours |
+
+The *Draw distance* mod scales all fog values of all levels
+([notes/mod-fog.md](../../notes/mod-fog.md)).
+
+## Memory and counts
+
+| Limit | Value | Source |
+|---|---|---|
+| level memory | **16 MB** for STPC, TEXT, TRAK, MAP, LGPC and the strat pool; originals use up to ~7 MB | `FUN_0041eea0` |
+| strat heap | 65533 words (≈ 256 KB) for strat slots (0x154 bytes each), collision blocks and variables | `FUN_0041ae20` |
+| strat slots | `poolExtra + 30` – must cover placed **and** spawned objects | MAP |
+| vertices per tile model | 8000 (transform buffer) | |
+| collision polygon | within ±8 units of its tile's origin | i16 fixed point |
+| texture pages | 127 | signed page byte |
+| texture entries | 65535 | u16 face field |
+| sound samples | 128 per level | signed char id |
+| file sizes that worked | TRAK up to 1 MB, 5800 tiles, WAD up to ~7 MB (originals); the test world: 628 models, 2474 tiles, 6.3 MB | measured |
+
+## Things that crash the game
+
+| Cause | Symptom |
+|---|---|
+| a tile outside the W × H grid | memory corruption, crash on load or later |
+| vertex-colour block not exactly one entry per vertex | objects read shifted, crash |
+| a strat type with collision but type flags 0 (or too few collision-bone words) | page fault in the heap allocator `FUN_0041ae20` |
+| exit target (7, 7, 7) in world 9 | crash after saving (world 10 has no name) |
+| a selectable chapter without a WAD | "Couldnt load wad" on the world map |
+| a waypoint-dependent type without its boxes | not a crash: the game removes the object ("removing strat") |
+| world-9 chapters 2–31 (unpatched exe) | progress, language or options overwritten ([TestLevel](testlevel.md)) |
+
+## Coordinates, numbers, angles
+
+* Game space: x east, y up, z = grid row; strats use 20.12 fixed point (4096 = 1.0).
+* MAP angles: 4096 = 360°; strat angles: 0x1000000 = 360°.
+* Objects on a flat original floor tile stand at `tile.y + 0.25`.
@@ -0,0 +1,110 @@
+# Game files
+
+What is on the CD and on the hard disk, how files are named, and the small formats around the
+levels. The level files themselves are described in [WAD container](wad.md).
+
+## Two folders: HD and CD
+
+The installer copies a small **HD** part to the hard disk; everything big stays on the **CD**. The
+game looks up each file in `HDPath\dir\file`, then in `CDPath\dir\file`, then on every CD drive
+(`FUN_00415690`). A plain folder in `CDPath` is enough – no real CD drive is needed. LlamaMod relies
+on this: it points `CDPath` at its own `cd-active` folder, where mod outputs replace original files
+([notes/llamamod-app.md](../../notes/llamamod-app.md#registry-cd-path-and-the-exe-patch)).
+
+| Folder | Contents |
+|---|---|
+| HD (`Setup/<lang>/Hd` on the CD) | `groove.exe`, `aal.dll`, `aleax2.3dl`, the audio codecs `asfcodec.adl` and `Vagcodec.adl`, `music/english.cvs` (speech), save games `king0.ksv`…`king2.ksv` |
+| CD (`Setup/<lang>/Cd`) | `wads/` level files, `music/*.asf` music, `movies/*.dat` videos, `*.cor` pictures, `test9.tle`, empty folders `gallery/`, `in/`, `out/` |
+
+Registry key (all values): `HKEY_LOCAL_MACHINE\Software\Disney Interactive\Emperors New Groove\1.0`
+with `CDPath`, `HDPath`, screen size, volumes and devices. LlamaMod's base patch of `groove.exe`
+redirects it to `HKEY_CURRENT_USER`, so no admin rights are needed.
+
+Development used the **German CD**. The English first release is supported as well: all exe
+patches find their places in both builds (table below). Its own CD data has not been tested yet –
+the formats are expected to be the same.
+
+### groove.exe versions
+
+| Build | PE date | Size | Notes |
+|---|---|---|---|
+| German | 2001-02-12 | 1,642,496 bytes | reference for all addresses in these pages |
+| English (first release, menu "Start Game") | 2000-10-17 | 1,634,304 bytes | same code, shifted (e.g. main menu frame handler 0x549990 instead of 0x549C50); .data globals laid out differently (game state 0x583D74 instead of 0x5846E4, player strat 0x6D94A4 instead of 0x6D9E1C); .data 0xD000 bytes in the file instead of 0xE000 |
+
+LlamaMod supports both (`exe/Site` lists every address it uses in both builds). Addresses in the
+reference pages are those of the German build.
+
+## Level naming scheme
+
+Levels are named **`t<tribe>l<world>m<chapter>`** (tribe is always 1 in the game):
+
+| World | Name | Files | Notes |
+|---|---|---|---|
+| 1 | Village | t1l1m001–004 | `t1l1m001` is the default base level for new levels |
+| 2 | Jungle at Night | t1l2m001–003 | t1l2m003 is the llama chase (player strat `LlamaChase`) |
+| 3 | River | t1l3m001–004 | player strat `KuscoAndPachaTogetherOnATree` |
+| 4 | Jungle by Day | t1l4m001–003 | t1l4m002 has the Alligator (used by the arena) |
+| 5 | Mountain | t1l5m001–003 | |
+| 6 | City | t1l6m001–003 | |
+| 7 | Catacombs | t1l7m001–005 | m001/3/5 are roller-coaster rides (player strat `RollerCoaster`) |
+| 8 | Lab | t1l8m001–006 | |
+| 9 | TestLevel | none on the CD | 49 chapter slots, see [TestLevel](testlevel.md) |
+
+Other WADs: `t0i0m000` (front end), `t0i0m998` / `t0i0m999` (outro and game-over backdrops),
+`t6l6m001/002` (memory-card/options screens – *likely*), `FESOUND.WAD` (front-end sound bank, not
+a chunk file). The chapter counts the world map uses are a table in `groove.exe` (0x572420):
+4, 3, 4, 3, 3, 3, 5, 5, 49 – world 8 has one more file than its table entry (*unknown* why).
+
+## Pictures (COR)
+
+| File | Use |
+|---|---|
+| `T1<w><c>.COR` | loading picture of world *w*, chapter *c* (`T191.COR` … `T1949.COR` for TestLevel) |
+| `<w><c><n>.cor` | concept art shown with a chapter (*likely*) |
+| `tally<n>.cor`, `gameover.cor`, `loading.cor`, logos | screens; `gameovertest.cor` is unused |
+
+Format (*certain*, [`tools/cor2png.py`](../../tools/cor2png.py)): 8-byte signature
+`17 98 AF 89 FE 42 D1 12`, u32 version 1, u32 unpacked size, u32 packed size, then LZ data:
+a byte `n < 0x80` = *n* literal bytes follow; `1LLLoooo oooooooo` = copy L+3 bytes from *o* bytes
+back. The result is 640×480 RGB (a few greyscale ones). [`tools/png2cor.py`](../../tools/png2cor.py)
+and [`CorEncoder.java`](../../src/main/java/com/eliasmueller/llamamod/format/CorEncoder.java) write
+it; LlamaMod uses that for the loading pictures of new levels.
+
+## Movies and demos
+
+* `movies/<w><c><n>intro.dat` / `…outro.dat` and the logo movies: MPEG-1 video 320×240, 29.97 fps,
+  MP2 audio, played through DirectShow. The Intro skip mod patches the calls that start them
+  ([notes/mod-introskip.md](../../notes/mod-introskip.md)).
+* `wads/*.DEM`: recorded attract-mode demos, u32 frame count + 8 bytes of input per frame
+  (*likely*; not used by LlamaMod).
+
+## Save games (KSV)
+
+`king0.ksv`…`king2.ksv` in the game folder, 256 bytes each. Decoded from the load/save functions
+`FUN_0041c640` / `FUN_0041c820`; code: [`save/Ksv.java`](../../src/main/java/com/eliasmueller/llamamod/save/Ksv.java).
+
+| Offset | Meaning |
+|---|---|
+| 0x00 | used flag (0 = empty) |
+| 0x01 / 0x02 | lives / energy |
+| 0x03–0x06 | world-map cursor: tribe, world, chapter, map |
+| 0x07 | number of gold coins |
+| 0x08–0x3D | u8 [9][6] chapter flags (bit 0 collectible found, bit 1 all coins = gold coin) |
+| 0x3E–0x41 | last played tribe, world, chapter, map |
+| 0x42 / 0x43 | highest unlocked world / chapter |
+| 0x44–0xAF | u16 [9][6] coins per chapter |
+| 0xB0–0xCF | unknown |
+| 0xD0–0xD9 | options (effects and music volume, speaker mode, …) |
+
+To start a TestLevel chapter without a mod, set the cursor, the last played and the highest
+unlocked world/chapter to 9 and the chapter. LlamaMod does this with `llamamod --unlock <slot> 9 <chapter> --cursor`
+and with the *Save games* tab.
+
+## Hidden debug features
+
+Strings and code in `groove.exe` point to leftovers of the developers' tools. They were seen in the
+binary but **not** verified or used by LlamaMod: F6 writes a screenshot `capture<n>.tga`, the
+command-line switch `-display_diagnostics` writes a `<PC name>.dispdiag` file, a log
+`c:\kingdom_dbg.txt`, and an unused slide-show player that reads the empty `in`/`out` folders.
+The *Built-in cheats* mod uses the game's own cheat codes
+([notes/mod-cheats.md](../../notes/mod-cheats.md)).
@@ -0,0 +1,155 @@
+# Geometry and collision
+
+The world is **not** one big mesh and there is no BSP. It is a **grid of tiles**, inherited from
+Croc: TRAK holds a set of small models (the level's construction kit), and MAP places them on a
+W × H grid, one cell = one unit. Every byte described here is reproduced exactly by
+[`format/Trak.java`](../../src/main/java/com/eliasmueller/llamamod/format/Trak.java),
+[`format/MapChunk.java`](../../src/main/java/com/eliasmueller/llamamod/format/MapChunk.java) and
+[`tools/geomlib.py`](../../tools/geomlib.py) for all original levels.
+
+Full detail with all loader addresses: [notes/geometry.md](../../notes/geometry.md).
+
+![The test world from above in the editor: every square is one grid cell](../img/testworld-top.jpg)
+
+## Coordinate spaces
+
+| Space | Used by | Axes |
+|---|---|---|
+| **Game space** | strats, collision, MAP fixed-point tile positions, lights | x east, **y up**, z = grid row (positive); 20.12 fixed point (4096 = 1.0); right-handed as the game shows it |
+| **Export space** | TRAK/STPC vertices, MAP float tile positions | same, but **z negated** (grid at z ∈ (−H, 0]); drawn by a Direct3D (left-handed) camera |
+| **File space** | OBJ/glTF of every LlamaMod and kit tool | = game space (y up, right-handed): Blender shows a level the same way round as the game |
+
+Converting export ↔ file space negates z and reverses the triangle corner order. Angles:
+4096 = 360° in MAP records; the strat VM uses 0x1000000 = 360°. A tile is turned only about y
+(0, 1024, 2048, 3072 in practice). Rotation 0 faces +z, 90° faces +x.
+
+## TRAK: tile models (*certain*)
+
+`u32 n`, then **all n headers** (0x84 bytes each), then the data of every model in order.
+Typical levels have 100–650 models with up to 422 vertices / 798 faces each.
+
+| Header field | Meaning |
+|---|---|
+| 0x00 | bounding-box centre (3 × f32) |
+| 0x0c | 8 box corners (used for frustum culling) |
+| 0x6c / 0x6e | vertex count / face count |
+| 0x78 / 0x7a / 0x7c | collision polygon counts in three groups (the engine always uses the sum; meaning of the groups *unknown*) |
+| pointers | 0 in the file, set on load |
+
+Data per model:
+
+* **Vertex**, 24 bytes: `f32 x, y, z, nx, ny, nz` (lighting comes from the MAP vertex colours, not
+  from the normals).
+* **Face**, 28 bytes, triangles only: `u16 flags, u16 v0, v1, v2, u16 texture, u16 0, f32 plane
+  nx, ny, nz, d`.
+* **Collision polygon**, 32 bytes: `u8 type, u8 material`, then 5 planes `{i8 nx, ny, nz, u8 0,
+  i16 d}`. Plane 0 is the surface, planes 1–4 the edges (normals point inwards). Type bit 0 =
+  quad, otherwise triangle. Normals are ×127, d is 20.12 fixed point – so a collision polygon
+  must lie within **±8 units of its tile's origin**.
+
+### Face flags
+
+| Bit | Meaning |
+|---|---|
+| 0x0008 | start of a new render batch (texture page or blend mode changes) – must be set on the first face of each batch, at the latest every 256 faces |
+| 0x0010, 0x0020, 0x0800 | which corners of the texture rectangle the triangle uses (below) |
+| 0x0400 | double-sided (no backface culling) |
+| 0x4000 | ignore vertex colours |
+| 0x0001, 0x0002 | special sorting/transparency modes (*likely*) |
+| others | present in the data, not read by the PC renderer (*unknown*, probably PlayStation leftovers) |
+
+### No free texture coordinates
+
+The engine has **no per-vertex UVs**. Every triangle shows one half of a texture rectangle from the
+TEXT table: with flag 0x800 the face is the first or (with 0x10) second half of a quad, without it
+a triangle covering the lower-left half; 0x20 mirrors horizontally. 96 % of world faces are quad
+halves. This is why the level builder and editor split surfaces into 1 × 1 pieces and why a narrow
+wall shows a squashed texture. See [Textures](textures.md).
+
+## MAP: the tile grid (*certain*)
+
+MAP starts with the grid and the tiles; objects follow (see [Objects](objects.md)). The blocks that
+concern geometry:
+
+| Block | Format |
+|---|---|
+| header | `u32 nTiles, u32 W, u32 H` |
+| tiles (floats) | nTiles × `{f32 x, y, z, u32 rotY, u32 model, u32 hasAlt}` in export space; x, z = cell centre |
+| regions | 32 × `{u32 visibility mask, i32 value}`, then W·H × u32 region number per cell |
+| tiles (fixed point) | nTiles × `{rx, ry, rz, x, y, z}` 20.12 in game space – used for drawing and collision; must match the float copy exactly |
+| model index | nTiles × u32 (= the float block's `model`) |
+| tile swaps (WFPC 0x10000) | one `{cellX, y, cellZ, modelA, modelB}` per tile with `hasAlt ≠ 0`: doors and bridges that change their model (strat opcodes 0x11a / 0x11b) |
+| vertex colours | per tile: one u32 RGBA per vertex of its model (0x80 = 1.0, the game doubles and clamps); more sets for animated colours; then the same for the swap model |
+
+Rules that crash the game or corrupt the level when broken:
+
+* every tile must lie inside the grid (`0 ≤ x < W`, `0 ≤ row < H`) – outside, the cell list
+  writes into foreign memory;
+* the vertex-colour block must have **exactly** one entry per vertex of the tile's model – else
+  everything after it (the objects) is read shifted;
+* the float and fixed-point copies and the model index must agree;
+* tile swaps: one entry per tile with `hasAlt ≠ 0`, in tile order.
+
+The cell of a tile is `floor(x) + floor(−z) · W` (export-space floats).
+
+## Collision (*certain*)
+
+* Only **the tiles listed in the cell the player stands in** are tested (`FUN_004036d0` floors and
+  ceilings, `FUN_00403ad0` walls). A wall polygon that sticks into the neighbouring cell has no
+  effect there – builders enter a polygon into every cell it covers, as a collision-only tile if
+  needed.
+* Collision is in game space, relative to the tile's fixed-point position.
+* There is **no step-up logic**: a 0.12-unit edge with a wall polygon already blocks the llama.
+  Low plinths need walls without collision; stairs need an invisible slope.
+
+### Collision materials
+
+The material byte ends up in the player's ground state and is read by strats (`floorMaterial`).
+
+| Material | Meaning |
+|---|---|
+| 0 | normal ground |
+| **16** | **exit floor**: the LevelDoor ends the level only when the llama stands on material 16 in the door's cell; also used under the village house doors (zone teleports) |
+| 17, 18 | ignored when WFPC flag 0x8000000 is set (*likely*: special surfaces) |
+| **30** (0x1e) | death plane / water (*likely*): falling onto it empties the energy and the llama respawns at the last checkpoint or the start (Model 0 of many levels is such an invisible plane at y = −2.75) |
+| others | special surfaces, meaning *unknown* – the debug view colours them |
+
+![Debug view of Village 3: collision frames, invisible walls in red, objects as markers](../img/debug-view.jpg)
+
+## Visibility regions (no BSP)
+
+Drawing (`FUN_0042bf40`) walks the grid cells within the draw distance around the camera and draws
+a cell's tiles **only if the cell's region bit is set in the mask of the camera's region**. Up to 32
+regions; mask 0 or a camera outside the grid means "everything". New geometry must therefore get a
+region that the surrounding regions can see, or it stays invisible – the builders put everything
+into region 0 with mask `0xffffffff`. Objects in hidden cells are skipped too (unless strat flag
+0x800). The editor's *Visibility regions* tool edits this
+([manual chapter 13](../manual/13-visibility.md)).
+
+## STPC: object models and code
+
+STPC starts with the **object models** (same model format as TRAK, header 0x8c bytes, optionally
+skinned with a bone table), then the **animation sets** (per-frame bone matrices and compressed
+vertex deltas – the compression is only partly understood), then the **strat code units**
+([Strats](../strats/README.md)). The engine never parses the code; MAP records and bytecode refer
+into STPC by absolute byte offsets, so STPC can only be extended at the end or merged with
+relocation ([notes/editor-cross-import.md](../../notes/editor-cross-import.md)).
+
+## WFPC flags
+
+WFPC is a u32 of feature flags. Some change the data layout and must stay as they are: 0x10,
+0x100, 0x10000 (tile swaps), 0x100000, 0x200000, 0x4000000, 0x10000000. Others: 0x800 renderer
+fog flag, 0x80000 read by a strat opcode, 0x8000000 makes collision materials 17/18 ignored.
+
+## Writing new geometry – checklist
+
+1. TRAK: correct counts, bounding box and face planes recomputed, texture index below the
+   number of texture entries, batch bit 0x8, ≤ 8000 vertices per model.
+2. Collision polygons within ±8 units of the tile origin, entered into every cell they cover.
+3. MAP: tiles inside the grid, float/fixed/model blocks consistent, vertex colours exactly per
+   vertex, tile-swap block matching `hasAlt`, a visible region.
+4. Rewrite the WAD's total length.
+
+The editor and both level builders do all of this; the details of the builder's approach
+(splitting into tiles per cell and height band, merging identical tiles, baking sun, sky and
+ambient occlusion into vertex colours) are in [notes/levelbau.md](../../notes/levelbau.md).
@@ -0,0 +1,163 @@
+# Objects, waypoints, zones and lights
+
+Everything that is not static geometry lives in the second half of the MAP chunk: object
+instances ("strats"), their parameters, waypoint chains and environment zones. Lights are in their
+own chunk, LGHT. Full byte layouts: [notes/objects.md](../../notes/objects.md).
+
+## Strats: objects are programs
+
+An object – coin, enemy, door, camera, the player – is an instance of a **strat**: a script in the
+level's STPC code. A MAP record says *where* and *which code*; the code does the rest. There is no
+type id: **the type is the code's byte offset in STPC**. Type names come from the code itself
+(a `debugName "Coin"` instruction at the entry point). How the code works: [Strats](../strats/README.md).
+
+About 300 types are placed in the original levels, about 200 more are only spawned by other
+strats (splinters, effects, heads). The full list of which type appears in which level, with
+instance counts, is [notes/strat_types_table.md](../../notes/strat_types_table.md)
+(`tools/strat_table.py`).
+
+## The MAP object blocks
+
+After the geometry blocks ([Geometry](geometry.md#map-the-tile-grid-certain)):
+
+| Block | Format |
+|---|---|
+| parameter pool | `u32 n, n × u32` – all object parameters of the level, referenced by index |
+| environment zones | `u32 n, n × 90 bytes` (below) |
+| waypoints | `u32 n, n × 34 bytes {u32 next, u32, u16 rx, ry, rz, s32 x, y, z, u32, u32}`; `next ≠ 0` = the following entry belongs to the same chain |
+| strats | `u32 nStrats, u32 poolExtra`, nStrats × 58-byte records |
+| optional tail | paths (WFPC 0x200000, unused by the CD levels), a buffer size (WFPC 0x10), a u16 |
+
+### Strat record (58 bytes, *certain* unless noted)
+
+| Offset | Field |
+|---|---|
+| 0 | rotation x, y, z (u16 each, 4096 = 360°; x/z almost always 0) |
+| 6 | position x, y, z (s32, 20.12 fixed point, game space) |
+| 18 | **code offset in STPC = the type** |
+| 22 / 26 | parameter count / index into the parameter pool (−1 if none) |
+| 30 | number of strat variables (fixed per type) |
+| 34 | 16-byte slots for event handlers (fixed per type, *likely*) |
+| 38 | type flags: collision and physics setup (fixed per type) |
+| 42 | extra memory words (collision bones; fixed per type) |
+| 46 | first waypoint index or −1 |
+| 54 | flags; bit 1 = not created at level start |
+
+`poolExtra` is the number of strat slots beyond 30: the engine allocates `poolExtra + 30` slots,
+which must cover all placed objects **plus everything spawned at run time**.
+
+The type fields (variables, slots, flags, extra) come from the compiler and must be copied from an
+original instance of the same type; a type that uses collision but has type flags 0 crashes the
+game. Builders and the editor do this automatically.
+
+### Parameters
+
+The *n* parameters of an instance are pushed onto the new strat's stack and become its
+**variables v0 … v(n−1)**. Values are 20.12 fixed point by convention (0x1000 = 1.0), booleans
+0 / 0x1000, counts and world/chapter numbers `n << 12`. The editor knows the meaning of the
+parameters of many types (schemas in
+[`editor/tools/objects/Schemas.java`](../../src/main/java/com/eliasmueller/llamamod/editor/tools/objects/Schemas.java),
+findings in [notes/editor-object-schemas.md](../../notes/editor-object-schemas.md)); the others are
+shown raw with the values used in the original levels.
+
+### Waypoints
+
+A waypoint chain is a list of positions used for patrol paths, moving platforms, camera paths –
+and for some types (guards, box walkers) as a **pair of boxes** the object must stand in, or the
+game removes it ("removing strat"). Guards also wait for an **event bit** (global variable 95) that
+another object sets ([notes/editor-object-schemas.md](../../notes/editor-object-schemas.md#event-bits-global-95)).
+
+The **player's waypoint chain is the start camera**: the camera takes the first node within 2.5
+cells of the llama. A good start has one node about 2 cells behind the llama and 0.5 above it, and
+nothing solid right behind the llama (the camera moves aside).
+
+## Special objects
+
+| Role | Type | Notes |
+|---|---|---|
+| player start | `Llama` | exactly one per level (`RollerCoaster`, `KuscoAndPachaTogetherOnATree`, `LlamaChase` in special levels) |
+| checkpoint | `CheckPointPost` (spawns `CheckPointHead`), `CheckPointBox` | the respawn point after a fall |
+| exit | `LevelDoor` | invisible trigger, see below; variants `VillageEndDoor`, `EndGameDoor` |
+| cameras | `CameraSide`, `CutSceneCameraDirectional`, `CutSceneTrigger` | camera zones and cut scenes |
+| always present | `CheatTeleport`, `Wompy`, `CutSceneTrigger` | |
+
+### The exit (LevelDoor)
+
+An exit is **two parts working together** (decompiled strat code; the details below were checked
+in game in Jungle Day 2 with a debugger, the basic rule also in Village 1):
+
+* The **LevelDoor** object (no model) writes its three parameters – the next level (tribe, world,
+  chapter) – to globals g101–g103 and its grid cell to g104/g105. It does **not** end the level
+  itself in the cases we tested (see the details below).
+* **Kuzco's own script** ends the level when **all** of these hold:
+
+```
+floor material under Kuzco == 16              ; the remembered floor (see "floor test" below)
+and floor(x), floor(z) == the cell in g104/g105   ; the exit's grid cell, any height
+and Kuzco is at most ~0.6 above that floor's height
+-> level change to g101..g103 (tally screen)
+```
+
+  On a material-16 floor **outside** the exit cell the same check is a house door: fade-out and
+  the teleport of the environment zone of that cell.
+
+So a normal exit needs **a floor with collision material 16 in the exit's grid cell**. In several
+original levels that floor only exists after a tile swap opens the door (Village 1 and Jungle Day 2:
+the RubyIdolDoor swaps the tile to a model that has the material-16 pad; checked in game in Village
+1). The parameters of the originals are (1, world, chapter + 1); **(7, 7, 7)** in the last chapter of
+a world means "world finished" – in TestLevel that crashes, so custom levels use (1, 9, chapter).
+The tally shows coins x / LNFO total and secrets and unlocks the next chapter. The arena sets
+g101–g105 itself to make its own exit ([Arena](../strats/arena.md)).
+
+**Details checked in game (Jungle Day 2, t1l4m002, 2026-11-07):**
+
+* The LevelDoor stores its parameters and cell in g101–g105, then checks global 0x21 **once**
+  (after 5 ticks); if it is not 3 the door removes itself. In Jungle Day 2 it was gone after the
+  start, so the Llama's check is what ends the level. That check needs floor material 16, the
+  door's cell, and the llama no more than 0.6 above the recorded floor height. Off the exit cell
+  the same material-16 check is the house door (fade-out and zone teleport).
+* The floor test only looks at tiles in the player's cell and takes the **nearest upward floor
+  below the player, at any distance**. Material 17 is ignored for the llama. A llama hovering 3.7
+  units above a house-door pad records material 16.
+* Each tick runs all strat scripts first and then the floor tests. A position change made after
+  the floor tests is seen by the next tick's scripts with the **old** floor record. So hovering
+  above any house-door pad and then moving the llama straight to floor height in the exit cell
+  ends the level, even though the exit cell has no material 16 yet (it appears only in the swap
+  model when the RubyIdolDoor opens). Moving there from normal ground does nothing.
+
+## Environment zones (90 bytes, *certain* for the fields below)
+
+A zone sets fog, colours, music and sky, and optionally teleports the player.
+
+| Field | Meaning |
+|---|---|
+| cell x, y, z | the trigger cell |
+| target x, y, z, angle | teleport target and facing |
+| flags (+0x20) | flag 8 = **start zone** (exactly one per level: the level begins with its settings); flag 4 = do not move the player |
+| sky model | STPC offset of a sky model (0 = none) |
+| fog mode | 0 none, 1 darkness with a light around the player, 2 table fog, 3 vertex fog |
+| fog start / end | two pairs (detail Minimum and Maximum); **fog end = far clip = draw distance** |
+| colours | ambient colour for object lighting, fog/backdrop colour |
+| music id | 1–39 (see [Music](audio.md#music)), 0 stops the music |
+
+Teleports are triggered from strat code (opcode 0x100 looks up the zone of the calling object's
+cell). In the original levels the trigger cells hold exit floors (material 16) or door objects –
+this is how the village house doors work. The editor edits zones in the
+*Environment* panel ([manual chapter 12](../manual/12-environment.md)).
+
+## Lights
+
+LGHT: `u32 n`, then per light a type, a colour (×2/255) and direction or position (game space).
+Lights only light **object models** (ambient + all directional lights + the nearest point lights,
+at most 6). Tiles use baked vertex colours, so changing a light does not change the ground – bake
+the vertex colours again. Point lights are full up to radius *a* and fade to 0 at *b*; one byte
+makes them flicker.
+
+## Tools
+
+| Task | Tool |
+|---|---|
+| list types, instances, parameters of a level | [`tools/strats.py`](../../tools/strats.py) `level.wad [--all]`, [`tools/map_dump.py`](../../tools/map_dump.py) `--strats --tiles --lights` |
+| type × level table | [`tools/strat_table.py`](../../tools/strat_table.py) |
+| place objects from a script | [`tools/levelbuild.py`](../../tools/levelbuild.py) `L.strat(...)`, Java [`LevelBuilder`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelBuilder.java) |
+| place, edit, check objects visually | the level editor ([manual chapter 9](../manual/09-objects.md), [10](../manual/10-waypoints.md), [11](../manual/11-cameras-triggers.md)) |
@@ -0,0 +1,53 @@
+# TestLevel (world 9)
+
+The game has a hidden ninth world, **TestLevel**, with 49 chapter slots – but the retail CD ships
+no data for it. It is the natural home for custom levels: originals stay untouched, and the world
+map can reach it once a save game unlocks it. Every LlamaMod level mod, the Test World and the
+Alligator Arena are installed as `wads/T1L9M0nn.wad` with a loading picture `T19n.COR`.
+
+Code: [`save/TestLevelChapters.java`](../../src/main/java/com/eliasmueller/llamamod/save/TestLevelChapters.java),
+lab notes: [notes/testlevel-chapters.md](../../notes/testlevel-chapters.md).
+
+## Use chapters 1 and 32–49
+
+The game keeps per-chapter coin counters and flag bytes in arrays that only have rows for worlds
+0–8 (index `world · 6 + chapter`). For world 9, chapters 2–31 land on **other game variables**:
+
+| Chapter | What its coin counter / flag byte overwrites |
+|---|---|
+| 1 | nothing (free) |
+| 5–8 | the last played tribe/world/chapter/map |
+| 6–9 (flags) | the **language index** |
+| 9 | the **furthest progress** – the world map breaks |
+| 10–31 | options, HUD state and tables used by the original levels |
+| **32–49** | tables of tribes 2 and 3, which the game never uses – free |
+
+So custom levels use **chapter 1 or 32–49**. The editor only offers these, new projects take the
+first free chapter from 32, and old projects on other chapters are moved automatically.
+
+LlamaMod additionally relocates both arrays to a 128-entry buffer in unused space of `groove.exe`
+(base exe patch, revision 2), so even picking an empty chapter on the world map is harmless with
+LlamaMod's executable. Mods still keep to 1 and 32–49 so they also work with an unpatched exe.
+Save games are unaffected: a save after finishing a normal or TestLevel chapter is byte-identical
+with and without the relocation, and only the 54 entries of worlds 0–8 are saved.
+
+## Making world 9 reachable
+
+* **Empty chapters must exist.** Finishing chapter *n* unlocks chapter *n* + 1, and the world map
+  crashes ("Couldnt load wad") when a selectable chapter has no file. LlamaMod links every missing
+  `T1L9M002…049.wad` to an installed world-9 WAD and `T192…T1949.COR` to `T191.COR`.
+* **Never exit to (7, 7, 7).** "World finished" in world 9 unlocks a world 10 that has no name;
+  the game crashes after saving. Exits in TestLevel point to (1, 9, chapter).
+* **Get there:** set a save game's map cursor to world 9 (`llamamod --unlock <slot> 9 <chapter>
+  --cursor`, the launcher's *Save games* tab), or use the *Boot to level* mod / the editor's
+  play-test, which start the game directly in the level.
+
+## Tally totals
+
+The tally screen after the exit shows "coins collected *x* / *total*". *Total* is not counted by
+the game – it is the **LNFO** chunk (`u32 coins, u32 secrets`). A new level built on the village
+would show the village's 55. LlamaMod recounts it for new levels (Coin = 1, Coin5 = 5, Secret
+objects; the arena adds its dynamic coins).
+
+Cosmetic leftovers: the world map shows no background for world 9 and a garbage coin target, and
+the loading screen says "TestLevel Kapitel *n*".
@@ -0,0 +1,53 @@
+# Textures (TEXT chunk)
+
+Each level carries its own textures. Parse and rebuild are byte-identical for all level WADs
+(including the RLE encoder). Code: [`format/TextChunk.java`](../../src/main/java/com/eliasmueller/llamamod/format/TextChunk.java),
+[`tools/textchunk.py`](../../tools/textchunk.py). Lab notes: [notes/textures.md](../../notes/textures.md),
+editor side: [notes/editor-tools-textures.md](../../notes/editor-tools-textures.md).
+
+## Layout
+
+```
+u32 nPal                      0 in all WADs (8-bit palettes are unused)
+u32 nPages                    13–22 per level, all 256×256
+  nPages × { u32 flags, u32 w, u32 h, data }
+     flags & 0x80 : u32 length + RLE16      (all original pages)
+     other ≠ 0    : w·h raw u16
+u32 nTex                      ~180–1260 texture entries
+  nTex × { u16 flags, u8 page, u8 clut (0xff), u8 x0, x1, y0, y1 }    (edges inclusive)
+u32 nAnim                     texture animations
+  nAnim × { u16 texIndex, u8 type, payload }    type 8 = flip book: list of texture indices
+```
+
+RLE16: a sequence of s16 *n*; *n* > 0 → *n* literal pixels follow, *n* < 0 → the next pixel
+repeated −*n* times.
+
+## Pixels
+
+16 bit in **PlayStation order**: bits 0–4 red, 5–9 green, 10–14 blue, bit 15 = STP
+(semi-transparency). `0x0000` is fully transparent. Export to PNG uses alpha 0 = `0x0000`,
+alpha 128 = STP 0, alpha 255 = STP 1. The page flags (low 7 bits) select the blend class:
+1/6 opaque, 4/7 alpha blend, 5 another blend mode, 2/3 special converters (*likely* the
+PlayStation semi-transparency modes; details open).
+
+## Texture entries
+
+A face never has its own UVs: it names a **texture entry**, a rectangle on a page, and shows half
+of it ([Geometry](geometry.md#no-free-texture-coordinates)). Entry flag bit 0 = flat colour (the
+rectangle bytes are R, G, B instead) – the level builder appends such entries for plain colours.
+Other entry flag bits (blend mode, size class) are only partly understood.
+
+Limits: at most **127 pages** per level (signed page byte) and 65535 entries (u16 face field).
+
+## Changing textures
+
+* **Replace pixels, keep the table.** Exporting pages to PNG and importing them back changes no
+  index anywhere: `tools/text_export.py export level.wad dir` / `import level.wad dir new.wad`.
+* **Add pages and entries.** New pages and entries are appended; faces then use the new indices.
+  The editor's texture manager does this, including colour reduction, painting onto faces and
+  flip-book animations ([manual chapter 8](../manual/08-textures.md)).
+* **Same name, same picture.** Texture *indices* differ between base levels. The builders resolve
+  texture names (`grass`, `stone`, …) by picture fingerprint on each base and copy missing
+  village pictures over ([notes/levelbau.md](../../notes/levelbau.md)).
+
+![Contact sheet of the Village 1 textures with their indices, made by tools/texsheet.py](../img/village-textures.jpg)
@@ -0,0 +1,63 @@
+# WAD container
+
+A level is one file `wads/t1l<world>m<chapter>.wad`. It is a flat list of chunks:
+
+```
+u32 total length
+repeat:  u32 tag (four ASCII letters stored reversed: "OFNI" in the file = INFO)
+         u32 length
+         length bytes of chunk data
+```
+
+There are no checksums. When a chunk changes size, only the chunk length and the total length
+must be rewritten ([`format/Wad.java`](../../src/main/java/com/eliasmueller/llamamod/format/Wad.java),
+[`tools/wadtool.py`](../../tools/wadtool.py) – `wadtool.py list|extract|replace`).
+
+## Chunks
+
+In file order. "Loader" is the function in `groove.exe` that reads the chunk (dispatcher at
+0x558960).
+
+| Chunk | Contents | Documented in |
+|---|---|---|
+| INFO, VERS | u32 1 each, ignored | – |
+| WFPC | u32 feature flags of the level; they switch optional blocks in MAP and STPC on and off – never change them | [Geometry](geometry.md#wfpc-flags) |
+| TEXT | texture pages, texture rectangles, texture animations | [Textures](textures.md) |
+| FONT | 256 × 4 u16 glyph rectangles | – |
+| SPRT | sprite list (u32, more with WFPC 0x100000) | – |
+| NAME | u32 + level name (not shown anywhere in the game) | – |
+| SMPC | sound samples of the level (`cvg ` blocks) | [Music and sound](audio.md) |
+| AMPC | ambient sound data (`ambi`/`VABp`) | [Music and sound](audio.md) |
+| SRPC | references into the speech file `music/<lang>.cvs` | [Music and sound](audio.md) |
+| **TRAK** | world geometry: the tile models (render triangles + collision polygons) | [Geometry](geometry.md) |
+| **STPC** | object models, skeletal animations and the **strat code** (object behaviour) | [Geometry](geometry.md#stpc-object-models-and-code), [Strats](../strats/README.md) |
+| **MAP** | the tile grid, vertex colours, visibility regions, objects, waypoints, environment zones | [Geometry](geometry.md), [Objects](objects.md) |
+| LGHT | lights (directional and point lights for object models) | [Objects](objects.md#lights) |
+| LNFO | u32 coins, u32 secrets: the totals shown on the tally screen | [TestLevel](testlevel.md#tally-totals) |
+| LGPC | dialogue texts in all languages + speech slots | – |
+| END | end marker | – |
+
+Not every level has every chunk. The three chunks that matter for level building are **TRAK**,
+**STPC** and **MAP**; a new level takes everything else (textures, sounds, sky, fog, music) from an
+original **base level**.
+
+## The base-level idea
+
+An object type exists in a level only if its code is in that level's STPC. MAP refers to a type
+by its **byte offset into STPC** – there is no global type id. So every custom level starts as a
+copy of an original level (default: Village 1, `t1l1m001`) and replaces geometry and objects:
+
+* Python [`tools/levelbuild.py`](../../tools/levelbuild.py) and Java
+  [`levelbuild/LevelBuilder.java`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelBuilder.java)
+  generate TRAK and MAP from a script and keep STPC, TEXT and sound of the base.
+* The level editor stores only the difference to the base level and rebuilds the WAD from the
+  user's own CD ([notes/editor-format.md](../../notes/editor-format.md)).
+* Object types of *other* levels can be merged into the base's STPC together with their models,
+  animations, textures and sounds – the editor's *All worlds* import and the arena use this
+  ([notes/editor-cross-import.md](../../notes/editor-cross-import.md)).
+
+## Level memory
+
+The game loads STPC, TEXT (compressed pages + 20 bytes per texture entry), TRAK, MAP, LGPC and the
+strat pool into one **16 MB** block (`FUN_0041eea0`); original levels use up to about 7 MB. See
+[Engine facts and limits](engine-limits.md).
@@ -0,0 +1,120 @@
+# Strats: how objects work
+
+Every object in the game – a coin, a squirrel, a moving platform, a camera, the llama itself – is
+driven by a small program called a **strat** (Argonaut's "strategy" scripts, inherited from Croc).
+The programs are compiled bytecode for a virtual machine in `groove.exe` (`FUN_0054d180`). LlamaMod
+can read every one of them, change their numbers, write new ones and move them between levels.
+
+| Page | For |
+|---|---|
+| this page | how the VM works: units, instances, frames, variables, events, spawning, collision |
+| [Reading scripts](reading-scripts.md) | the editor's Script view and the assembly listing, with a worked example |
+| [The script language](script-language.md) | writing new behaviour in LlamaMod's structured language |
+| [Customising strats](custom-types.md) | changing constants, cloning types, custom types in the editor and in mods |
+| [Example: the Alligator Arena](arena.md) | a complete minigame written in the script language, explained step by step |
+| [Example: the roller coaster](roller-coaster.md) | a new ride for the original coaster cart: how the ride works, track and waypoint data, speed patch |
+
+Lab notes and tables: [notes/strat-opcodes.md](../../notes/strat-opcodes.md) (all 434 opcodes with
+semantics, confidence and Argonaut names), [notes/strat-language.md](../../notes/strat-language.md)
+(complete syntax), [notes/editor-object-schemas.md](../../notes/editor-object-schemas.md)
+(parameters of individual types). Machine-readable tables, used by the editor and the compiler:
+[`ops.tsv`](../../src/main/resources/com/eliasmueller/llamamod/format/strat/ops.tsv),
+[`props.tsv`](../../src/main/resources/com/eliasmueller/llamamod/format/strat/props.tsv).
+
+## Code units and types
+
+The strat code of a level sits at the end of its STPC chunk as a list of **code units**:
+`u32 nUnits`, then per unit `u32 nWords` and the words. A unit is one compiled source file and can
+contain several strats plus their name strings and data (for example `Spider` + `RopeForSpider`).
+The village has 53 units, Lab 1 has 65.
+
+A **type** is just an entry point into this code: a MAP record or a `spawn` instruction names a
+byte offset in STPC, and the code there starts with `debugName "Name"`. Code refers to models,
+animation sets and other code by **absolute STPC offsets** – which is why STPC cannot be
+rearranged without relocating every reference, and why each level carries its own copy of the
+code of every type it uses.
+
+LlamaMod's disassembler covers the code of all 34 level WADs (1461 units, 670 555 words) and
+assembles every unit back **byte-identically**.
+
+## One frame in the life of a strat
+
+The VM is a **stack machine** that runs every live strat once per frame (30 frames per second):
+
+1. The strat continues where it stopped last frame.
+2. It executes instructions – push values, compute, read and write properties, play animations,
+   move – until it reaches a **yield** (`jmpYield`, `jzYield`, `callYield` …).
+3. At the yield its turn ends; the next strat runs. Next frame it continues after the yield.
+
+So a typical object is "set up, then `loop { …; yield }`", and anything that takes time is a loop
+that counts frames. Speeds and turn rates in scripts are **per frame**.
+
+`end` / `remove` deletes the strat; `return` returns from a `call`.
+
+## Data a strat works with
+
+| Kind | Syntax | What it is |
+|---|---|---|
+| **variables** | `v0`, `v1`, … (or an alias name) | the strat's own variables (count = the type's *nVars*). The first *n* hold the instance's **MAP parameters** |
+| **properties** | `self.x`, `self.rotY`, `self.floorHeight`, `self.damageTaken` … | 194 named engine fields of the strat: position, rotation, floor under it, distance to the player, animation state, alpha, collision damage … |
+| other strats' properties | `player.x`, `parent.v3`, `camera.…`, `target.…`, `boss.…`, `dialog.…` | the player, the strat that spawned this one (`parent`), the camera and a few registered special strats |
+| **globals** | `g0` … | shared by all strats; the engine itself never reads most of them – their meaning comes from how scripts use them (e.g. g95 = event bits, g101–g105 = exit target and cell, g17–g20 = dive target) |
+| **numbers** | `1.0`, `90deg`, `204r` | 20.12 fixed point (4096 = 1.0 = one cell); angles 0x1000000 = 360°; `r` marks a raw integer |
+
+Binary operators pop *b* (top) then *a* and push `a op b`; comparisons push 0/1; `mul` = a·b >> 12.
+
+## Events
+
+A strat registers **event handlers** in its slots (`onEvent`, in the script language
+`on touched { … }` / `on event(type, param) { … }`). When the event fires, the handler runs like a
+subroutine. Known event types:
+
+| Type | Fires when |
+|---|---|
+| 4 | **touched**: contact with another strat (pick-ups, enemies). Needs collision (`collisionOn` + `collRadius`) |
+| 0x40 | timer |
+| 0x80 / 0x100 | player distance |
+
+## Spawning
+
+`spawn<params, vars, slots, typeFlags, extra>(arguments…, unit:N+offset)` creates a new strat from
+code: the five inline values are exactly the type fields of a MAP record
+([Objects](../reference/objects.md#strat-record-58-bytes-certain-unless-noted)), the stack
+arguments become the child's parameters, and the child's `parent` is the spawner. Facts found
+the hard way (by the arena):
+
+* The child appears at the spawner's **matrix position** of the last frame, not at its current
+  `x/y/z`: after `self.x = …` the spawner must **yield** before spawning.
+* A type that uses collision needs collision type flags (e.g. 0x28000 like Coin) and enough
+  `extra` words for its collision bones – otherwise the game crashes in the heap allocator.
+* The strat pool must have room for every spawned strat (`poolExtra`).
+
+## Collision and damage
+
+On contact, each side's `hitDamage` is copied into the other's `damageTaken`, and both get event 4.
+The llama's attacks set bits in its `hitDamage`: **256** kick (Action on the ground), **512** dive
+(Action in the air; it homes in on the target an enemy publishes in g17–g19), **1024** charge.
+The llama counts a contact as *its* hit if the other's `hitDamage` shares a bit with its own,
+otherwise `damageTaken & 127 == 1` costs it a heart and knocks it back. The original Alligator has
+513 (= 512 | 1): only the dive hurts it, a kick gets you bitten.
+
+## References to level data
+
+Some operands are indices into the level's own data and differ between levels; the cross-level
+import rewrites exactly these:
+
+| Operand | Points to |
+|---|---|
+| `model:N`, `anim:N`, `unit:N[+off]` (`address`, opcode 0xb2) | a model, an animation set, code of a unit; negative = shared animations in `DEFANIM.WAD` |
+| `sound:N` (opcode 0xd7) | a sample of the level's sound bank |
+| `text:N` (opcodes 0xf0, 0xfa) | a dialogue line in LGPC |
+| `tex:N` (pushed before texture opcodes) | a texture entry (shadows, sprites, particles) |
+
+## How the names were found
+
+All 434 opcodes (0x000–0x1b1) were named by decompiling every handler with Ghidra; 252 of them
+match Argonaut's own names from the Croc 2 PlayStation demo's jump table and the Croc 1
+decompilation (knowledge only, no code used – see the sources in
+[notes/strat-opcodes.md](../../notes/strat-opcodes.md#sources)). Confidence: 353 high, 79 medium,
+2 low; high-confidence opcodes cover 97 % of all instructions in the levels. The names of rarely
+used opcodes and properties can still be wrong.
@@ -0,0 +1,240 @@
+# Example: the Alligator Arena
+
+The *Alligator Arena* mod is a complete minigame built from scratch: a walled pit on an island,
+alligators coming in waves, coins popping out on every hit, an exit that opens after the last wave.
+It uses every technique of this documentation – a scripted level, two new strat types written in
+the [script language](script-language.md), and an object (the Alligator) imported from another
+world. This page walks through the code.
+
+![The arena: an alligator chasing the llama](../manual/img/mod_arena.jpg)
+
+| File | Role |
+|---|---|
+| [`ArenaMod.java`](../../src/main/java/com/eliasmueller/llamamod/mods/arena/ArenaMod.java) | the mod: options, writes the WAD and the loading picture |
+| [`Arena.java`](../../src/main/java/com/eliasmueller/llamamod/mods/arena/Arena.java) | the level script: geometry and object placement |
+| [`ArenaScripts.java`](../../src/main/java/com/eliasmueller/llamamod/mods/arena/ArenaScripts.java) | the strat scripts `ArenaMaster`, `ArenaGator` (and a test probe) |
+| [`ArenaImport.java`](../../src/main/java/com/eliasmueller/llamamod/mods/arena/ArenaImport.java) | compiles the scripts and merges them into the base level |
+| [`ArenaTest.java`](../../src/test/java/com/eliasmueller/llamamod/mods/arena/ArenaTest.java) | unit tests (scripts compile for all option corners, the built level decodes) |
+| [notes/mod-arena.md](../../notes/mod-arena.md) | lab notes: engine facts found, what was verified in the game |
+
+Options: alligator **lives** (1–10, default 5), **waves** (1–5, default 3; wave *n* brings
+min(*n*, 2) alligators), llama **energy** cap (1–5, default 4), **coins** per hit (0–5, default 1),
+TestLevel **chapter** (32–49, default 49).
+
+## 1. The plan
+
+* The **base level** is Village 1 (`t1l1m001`), like every new level: its code provides the
+  Llama, Coin, CheckPointPost and textures.
+* The Alligator lives in **Jungle by Day 2** (`t1l4m002`). Its model, animations and sounds are
+  needed, so the new scripts are **compiled against that level** and then **imported** into the
+  village base together with everything they reference.
+* Two new types: `ArenaMaster`, an invisible referee standing on the exit pad, and `ArenaGator`,
+  a new alligator spawned by the master.
+* The level goes into a TestLevel chapter ([why 32–49](../reference/testlevel.md)).
+
+## 2. The level (`Arena.build`)
+
+The level is a [`LevelScript`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelScript.java)
+for the Java [`LevelBuilder`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelBuilder.java),
+the same builder the Test World uses. Coordinates are game units (one cell each):
+
+```java
+l.sea(0, 0, 40, 40, -1.5, new double[] {ix0 - 3, iz0 - 3, ix1 + 3, iz1 + 3}); // sea + death plane
+l.floor(a.x0(), a.z0(), a.x1(), a.z1(), a.floor(), "sand");                    // pit floor 16..24
+l.box(a.x0() - t, a.z0() - t, a.x1() + t, a.z0(), 0, WALL,
+      o().top("stone").side("stone_moss"));                                    // one of four walls
+// exit pad: one cell with collision material 16 under a gate
+l.box(ex - 0.5, ez - 0.5, ex + 0.5, ez + 0.5, a.floor(), a.floor() + 0.06,
+      o().top("pattern_purple").side("inca").rot(0).sideColl(false).mat(DOOR_MAT));
+l.player(st[0], st[1], st[2], null, 1.6);          // llama + start camera node 1.6 behind it
+l.checkpoint(a.x0() + 0.8, a.z0() + 0.8);
+l.strat(ArenaScripts.MASTER, ex, ez, a.floor(), 0.0, null, LevelBuilder.Waypoints.NONE, 0, false);
+l.coins(List.of(new double[] {a.x0() + 0.6, 20}, new double[] {a.x1() - 0.6, 20}));
+```
+
+Points to note:
+
+* The **exit pad** is a 1 × 1 box whose top has collision **material 16** – the exit rule from
+  [Objects](../reference/objects.md#the-exit-leveldoor--certain). There is no LevelDoor; the master
+  takes its role.
+* The walls are 1.1 high – too high to jump (0.35), so the fight stays in the pit.
+* Texture names (`sand`, `stone_moss`, `inca`) are resolved on the base level by picture.
+
+## 3. Compiling and importing (`ArenaImport`)
+
+`Arena.buildWad` runs before the geometry is built:
+
+```java
+merged = ArenaImport.merge(baseWad, src, "t1l4m002", units(probe, debug));
+return LevelScript.super.buildWad(merged.wad(), wads, opts);
+```
+
+1. **`append`** compiles each unit with `StratCompiler` → `StratAssembler`, laid out as if it were
+   the last unit of **t1l4m002's** STPC, and appends it there. So `model:47` is the Alligator's model
+   and `unit:56+0xf0` is that level's `EnemyCoin`. A later unit can name an earlier one as
+   `unit:@ArenaGator`; `append` replaces that with `unit:N+offset`.
+2. **`merge`** asks [`StpcMerge`](../../src/main/java/com/eliasmueller/llamamod/format/stpcmerge/StpcMerge.java)
+   – the editor's cross-world import engine – to import the two entry points into the village:
+   it follows every reference and copies the model, 7 animation sets, textures, 3 sound samples and
+   the spawned strats (`EnemyCoin` and `Sparkles` already exist in the village and are shared),
+   relocates every operand and verifies the result.
+3. It adds one **unplaced prototype MAP record** per type with its type fields
+   (`nVars`, `slots`, `typeFlags`, `extra`), so the level builder can place the type by name.
+
+The type fields are declared in `Arena.units`:
+
+| Type | vars | slots | type flags | extra | why |
+|---|---|---|---|---|---|
+| ArenaGator | 16 | 5 | 0xC000 | 3 | collision like the Alligator; 3 collision bones |
+| ArenaMaster | 12 | 0 | 0 | 0 | invisible logic, no collision, no handlers |
+
+## 4. The referee: `ArenaMaster`
+
+`ArenaScripts.master()` generates the script; the waves are unrolled by Java. With 2 waves it
+reads like this (simplified):
+
+```
+strat ArenaMaster {
+    alias wave = v1
+    alias alive = v3
+    alias kills = v4
+    alias t = v5
+    g104 = -1                  // no exit cell yet (the llama's own exit check reads g104/g105)
+    g105 = -1
+    t = 60                     // 2 seconds
+    while (t > 0) { t -= 1; call cap; yield }
+
+    wave = 1
+    self.x = 20.5              // move to a spawn spot …
+    self.z = 22.2
+    yield                      // … and let the engine update the matrix before spawning
+    spawn<0, 16, 5, 50176, 3>(unit:@ArenaGator)
+    alive += 1
+    self.x = 20.5              // back onto the exit pad
+    self.z = 23.5
+    while (alive > 0) { call cap; yield }     // gators do parent.v3 -= 1 when they die
+    t = 45
+    while (t > 0) { t -= 1; call cap; yield }
+    wave = 2
+    …                          // two spawns this time
+
+    g101 = 4096r               // exit target (1, 9, chapter) as raw 20.12 values
+    g102 = 36864r
+    g103 = 200704r
+    g104 = int(self.x)         // the exit cell
+    g105 = int(self.z)
+    …                          // 5 bonus EnemyCoins
+    loop {
+        call cap
+        if (player.floorMaterial == 16 && int(self.x) == int(player.x)
+                && int(self.z) == int(player.z)) {
+            endLevel(4096r, 36864r, 200704r)  // the LevelDoor's rule
+            g1 += 1
+            remove
+        }
+        …                      // a Sparkles effect every 8 frames
+        yield
+    }
+}
+
+sub cap {                      // energy option: keep the llama's energy at the cap
+    if (player.health2 > 4) { player.health2 = 4 }
+}
+```
+
+What it shows:
+
+* **Variables as state** – `alive` is `v3`, which the gators change from outside with
+  `parent.v3 -= 1`: the parent/child link is the communication channel.
+* **Waiting = looping with yield**: every wait is a `while … yield` that also calls `cap`, so the
+  energy cap holds every frame (also after a respawn).
+* **The spawn rule**: move, `yield`, then `spawn` – without the yield the alligator would appear at
+  the master's old position (it copies the matrix of the last frame).
+* **The exit** is the LevelDoor logic written out: material 16 under the llama in the same cell →
+  `endLevel(tribe, world, chapter)`. Setting g101–g105 additionally arms the Llama's built-in check
+  for the same cell.
+
+## 5. The alligator: `ArenaGator`
+
+`ArenaScripts.gator()` reuses the original Alligator's assets but has its own behaviour. Its parts:
+
+**Setup** – model, size, collision and how it takes hits:
+
+```
+setModel(model:47)
+scale(1.5)
+self.hitDamage = 1793          // 1 | 256 | 512 | 1024
+collisionOn<16384>()
+collRadius(409r)
+collisionBone(0, 409r)         // three collision spheres along the body
+collisionBone(6.0, 409r)
+collisionBone(10.0, 409r)
+on touched {
+    if (self.damageTaken & 1792) {          // kick, dive or charge of the llama
+        if (cool <= 0 && lives > 0) { hit = 1 }
+    } else {
+        bit = 1                             // contact without an attack: it bit the llama
+    }
+}
+```
+
+`hitDamage` 1793 shares a bit with all three llama attacks, so each of them counts as the llama's
+hit; bit 1 makes a plain contact hurt the llama ([Collision and damage](README.md#collision-and-damage)).
+The handler only sets flags – the main loop reacts to them, which keeps the handler short.
+
+**Fade-in** – `setAmbient` from 0 to 63 over 32 frames, playing the idle animation.
+
+**Main loop** – a state machine in a `switch`, once per frame:
+
+| State | Behaviour |
+|---|---|
+| 0 watch | turn towards the player (2° per frame); after a timer, if the llama is within 5 cells and on the same floor height (±0.4), play the snap animation and sound |
+| 1 snap | wait for the animation, then start chasing |
+| 2 chase | accelerate up to `0.03 + 0.006 · wave` per frame towards the llama; lunge when closer than 1.2, give up after 75 frames |
+| 4, 5 lunge | fast forward move, then slow down (numbers from the original Alligator) |
+| 3 back off | move backwards for a few frames, then rest and watch again |
+
+Before the `switch`, the flags from the handler are handled:
+
+* `hit`: lose a life, sound, three green particle puffs, *coins* `EnemyCoin`s, blink for 45
+  frames (alpha 0.25 and a red tint every 4 frames, no further hits meanwhile), back off.
+* `bit`: back off and rest 90 frames, so the llama gets a breather.
+
+After the `switch` the gator is clamped to the pit and to the floor height.
+
+**Death** – when `lives` reaches 0 the loop `break`s: collision off, the original's death (shrink
+over a few frames with puffs, five `EnemyCoin`s), then `parent.v3 -= 1` (one alive less for the
+master), `parent.v4 += 1` (kills) and `remove`.
+
+**`sub aim`** – ported from the original Alligator: each frame it publishes its position in
+g17–g19 (and the distance in g20) if it is the best target below a jumping llama. That is what makes
+the llama's **dive** home in on it.
+
+## 6. The mod (`ArenaMod`)
+
+`apply` refuses a chapter another mod already wrote, builds the WAD, rewrites the tally total
+(`LevelTally.counted`: 2 placed coins + every coin the alligators can drop + 5 bonus), writes it
+to `wads/T1L9M0nn.wad` and draws a loading picture with Java2D (`CorEncoder`). That is all a level
+mod needs: LlamaMod's mod pipeline puts the files into the game's CD folder and links the empty
+TestLevel chapters.
+
+## 7. How it was tested
+
+* `ArenaTest` compiles the scripts for every corner of the options, checks wave sizes, builds the
+  level from the CD and decodes the merged code (the master spawns the gator unit, the gator
+  spawns EnemyCoin).
+* In the game ([`tools/apptest.py`](../../tools/apptest.py)): a probe type (`ArenaProbe`, option
+  `probe=true`) proved that compiled `on touched` handlers fire; then fights with default options,
+  a quick win with `lives=1, waves=1`, and a defeat (energy 0 → *Continue* restarts the arena).
+
+![Defeated alligator: puffs and coins](../img/strats/arena_defeat.jpg)
+
+![Win: bonus coins on the exit pad, then the tally](../img/strats/arena_win.jpg)
+
+## What to take from it
+
+1. Borrow assets by **compiling against the level that has them** and importing with `StpcMerge`.
+2. Keep event handlers short; set flags and react in the main loop.
+3. Communicate through `parent.vN` and globals; spawn only after a `yield`.
+4. Copy numbers (speeds, animation indices, type fields) from the original type's script.
+5. Write the exit yourself if you need a condition – material 16 + same cell + `endLevel`.
@@ -0,0 +1,101 @@
+# Customising strats
+
+From the smallest change to a completely new object type. Steps 1–5 need only the level editor;
+step 6 is for programmers writing a LlamaMod mod.
+
+| Step | What changes | Where it is stored |
+|---|---|---|
+| 1. Object parameters | one placed object | the project's object list |
+| 2. Constants | a number in a type's code – every object of that type | `stratEdits.constants` |
+| 3. Import a type from another level | the level's code gets a new type with its models, sounds, texts | the project's import list |
+| 4. Clone a type | a new type as a copy of an existing one | `stratEdits.types` (source text) |
+| 5. New type from a script | a new type written from scratch | `stratEdits.types` |
+| 6. Script types in a mod | types compiled and merged by Java code | the mod's source |
+
+A project never stores game code: constants are stored as *old → new value at an offset*, custom
+types as source text, imports as *type X from level Y*. Everything is rebuilt from the player's own
+CD when the project is opened ([notes/editor-format.md](../../notes/editor-format.md)).
+
+## 1. Object parameters
+
+Select an object; the Inspector's *Object parameters* section shows its MAP parameters (= the
+variables v0, v1, … of its strat). For many common types the editor knows names, ranges and meanings
+(schemas in [`Schemas.java`](../../src/main/java/com/eliasmueller/llamamod/editor/tools/objects/Schemas.java));
+the rest are raw values with the values used in the original levels as a hint.
+User guide: [manual chapter 9](../manual/09-objects.md).
+
+## 2. Constants
+
+Double-click a line with a number in the Script panel (or *Edit value…*). The change applies to
+every object of the type, is undoable and turns the line orange. On load the old value is checked
+first, so a project made for another game version cannot corrupt the code silently. A
+`pushShort` holds only −8.0 … 7.99; larger values need a source edit.
+
+![Original and edited Coin constant in the game](../manual/img/strat_coin_constant_ab.jpg)
+
+## 3. Importing types from other levels
+
+*Assets → All worlds* lists every object of every level; dragging one into the viewport imports it.
+The import copies the type's code **and everything it reaches**: spawned sub-strats (projectiles,
+shards, heads), models, animation sets, textures, sound samples and dialogue lines, relocates all
+references, shares what the level already has (Coin, EnemyCoin, Sparkles …) and verifies the
+merged code. Limits: 16 MB level memory, 128 sounds, 127 texture pages.
+Details: [notes/editor-cross-import.md](../../notes/editor-cross-import.md),
+[manual chapter 9](../manual/09-objects.md#importing-objects-from-other-worlds).
+
+## 4. Cloning a type
+
+*Clone as new type…* in the Script panel copies a type's listing into the type editor, renamed.
+Change what you need, *Check* (assemble and verify) and *Create type*. The new unit is appended at
+the end of the level's code – nothing else moves – and the type appears in *Assets → Objects*.
+
+* **Type fields / parameters from** decides which existing type's MAP fields (variables, slots,
+  collision flags, extra words) and parameter names new objects get. Pick the type you cloned,
+  unless you changed how many variables or collision bones the code uses.
+* *Edit type…* and *Delete type…* work later on, with undo; placed objects follow their type.
+* Custom types can refer to each other by name (`unit:OtherType`).
+
+The manual's tutorial *Make the squirrel run in a circle* clones Bucky and inserts a circle loop
+([manual chapter 22](../manual/22-strats.md#tutorial-make-the-squirrel-run-in-a-circle)).
+
+![Two squirrels running in circles: waypoint chain and custom script](../manual/img/strat_bucky_circle.jpg)
+
+## 5. A new type from a script
+
+*Level → New object type from script…* opens the type editor with a template. Set *Language* to
+*Script* and write the behaviour in the [script language](script-language.md). Models, animations
+and sounds are those of the current level (`model:N`, `anim:N`, `sound:N` – look them up in the
+Script panel of a type that uses them). Choose *Type fields from* a type with similar needs (a
+pick-up: Coin; a walking enemy: one of the enemies).
+
+## 6. Script types in a mod (Java)
+
+A mod can do the same in code. The arena shows the pattern
+([`mods/arena/`](../../src/main/java/com/eliasmueller/llamamod/mods/arena/)):
+
+1. Write the types as script-language text (often with values filled in from options).
+2. **Compile against a source level** whose models, animations and sounds you want to use – the
+   indices in the script are that level's:
+   `StratAssembler.assemble(StratCompiler.compile(src), StratListing.layout(stpcImage, base))`
+   and append the words as a new unit to the source level's STPC (`ArenaImport.append`).
+3. **Merge into the base level** with `StpcMerge` (the same engine as the editor's import): it
+   copies the closure (models, animation sets, textures, sounds, spawned strats), relocates and
+   verifies. Add one unplaced prototype MAP record per type with its type fields.
+4. **Build the level** with a `LevelScript` / `LevelBuilder`
+   ([`levelbuild/`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/)) and place the types by
+   name with `l.strat(...)`.
+5. Write the WAD into a TestLevel chapter from the mod's `apply` and add a loading picture.
+
+The [arena page](arena.md) walks through every part of this.
+
+## Choosing type fields
+
+| Field | What to put there |
+|---|---|
+| variables | at least the highest `vN` the code uses + 1 (parameters count as variables) |
+| slots | number of event handler slots (`on …` blocks) – at least 1 if there is one |
+| type flags | 0 for invisible logic; collision types need collision flags (Coin: 0x28000; Alligator: 0xC000 / 0xC400) |
+| extra | collision-bone words: at least the number of `collisionBone` calls |
+
+Wrong values do not always fail at once: too small collision areas corrupt the strat heap and
+crash later (page fault in `FUN_0041ae20`).
@@ -0,0 +1,114 @@
+# Reading scripts
+
+LlamaMod shows every strat in two forms: the **Script view**, a readable reconstruction, and the
+**Assembly** listing, the exact instructions. Both are in the level editor's *Script* panel
+(**View → Panels → Script**, **Ctrl+Shift+K**); the user-level walkthrough is
+[manual chapter 22](../manual/22-strats.md).
+
+![The Script panel with Bucky's script](../manual/img/strat_script_panel.jpg)
+
+Code: [`StratListing`](../../src/main/java/com/eliasmueller/llamamod/format/strat/StratListing.java)
+(assembly), [`StratPseudo`](../../src/main/java/com/eliasmueller/llamamod/format/strat/StratPseudo.java)
+(script view), [`OpTable`](../../src/main/java/com/eliasmueller/llamamod/format/strat/OpTable.java)
+(names and help texts).
+
+## Example: the Coin
+
+Script view of the village coin:
+
+```
+strat Coin:
+setModel(model:5)
+collRadius(409r)
+onEvent ev_0000, 0  // event type 4 → L_0084
+if (v1) { collisionOn<32768>() ... }
+if (v0) {
+    if (self.floorMaterial == -1.0) { skipArgs … } else {
+        self.y = self.floorHeight + 204r
+        self.rotY = rnd(4096.0)
+    }
+}
+loop { turnLeft(5.625deg); yield }
+```
+
+Line by line:
+
+| Line | Meaning |
+|---|---|
+| `setModel(model:5)` | show model 5 of this level's STPC (the coin) |
+| `collRadius(409r)` | collision radius 409/4096 ≈ 0.1 cell |
+| `onEvent ev_0000, 0` | install the handler table entry `ev_0000` in slot 0: event type 4 (touched) jumps to `L_0084`, the pick-up code |
+| `if (v1) …` | parameter 1 switches collision on |
+| `if (v0) …` | parameter 0 (`snapToFloor` in the editor) puts the coin 204/4096 ≈ 0.05 above the floor under it and turns it randomly – unless there is no floor (`floorMaterial == -1`) |
+| `loop { turnLeft(5.625deg); yield }` | spin 5.625° per frame, forever |
+
+Changing `204r` to `1.5` makes every snapping coin float 1.5 cells high – that is a constant edit
+([Customising strats](custom-types.md)).
+
+## Script view conventions
+
+| You see | It means |
+|---|---|
+| `self.x`, `player.y`, `parent.v3` | property or variable of this strat, the player, the spawner |
+| `v0`, `snapToFloor` | variable 0; named when the editor knows the type's parameter |
+| `g12` | global variable 12 |
+| `1.0`, `5.625deg`, `204r` | fixed point (1.0 = one cell), an angle, a raw integer (204/4096) |
+| `op<a, b>(x, y)` | instruction `op` with inline operands `a, b` and stack arguments `x, y` |
+| `loop { … yield }` | runs once per frame |
+| `while`, `do … while`, `switch`, `break`, `continue`, `break name` | rebuilt from the jumps |
+| `a && b`, `a \|\| b` | short-circuit conditions (chains of conditional jumps) |
+| `goto L_xxxx` | jumps that do not form nested blocks – 31 places in the whole game, all one pattern in the llama's script |
+
+The script view is a **reading aid** and is not compiled back. Edits happen on the assembly (or
+in the script language for new types).
+
+## The assembly listing
+
+One instruction per line, exactly as stored:
+
+```
+Coin:
+        debugName "Coin"
+        address model:5                      ; model
+        setModel
+        onEvent ev_0000, 0                   ; event type 4 → L_0084
+        pushVar snapToFloor                  ; v0 (alias from the object schema)
+        jz L_018c
+        ...
+L_0218:
+        push 5.625deg                        ; = 64.0
+        turnLeft
+        jmpYield L_0218
+        end
+```
+
+* Short opcodes (below 0x45) carry a signed 16-bit operand: `pushVar v3`, `pushShort 1.5`,
+  `jz label`. Long opcodes take inline words: `spawn 3, 6, 0, 0, 0`.
+* Directives: `.unit`, `.alias`, `.word`, `.string`, `.event`, `.switch` / `.case`, `.at`.
+* Disassemble → assemble is byte-identical for all 1461 units of the game; no instruction is
+  emitted as raw words.
+
+Full syntax: [notes/strat-language.md](../../notes/strat-language.md). Every opcode with its stack
+effect and meaning: [notes/strat-opcodes.md](../../notes/strat-opcodes.md).
+
+## Finding things
+
+* **Which script runs this object?** Select it with *Follow selection* on.
+* **Who spawns this type?** The side panel lists the units that reference it.
+* **What does this instruction do?** Select the line; the side panel shows the opcode's
+  semantics, stack effect, Argonaut name and confidence.
+* **Where is this variable used?** *Uses* lists every line with the selected operand.
+* **Outside the editor:** [`tools/strats.py`](../../tools/strats.py) `level.wad --all` lists every
+  named strat of a level with code offsets and type fields;
+  [notes/strat_types_table.md](../../notes/strat_types_table.md) shows which level has which type.
+
+## Typical patterns
+
+| Pattern | Meaning |
+|---|---|
+| `v1 * 30` | seconds → frames |
+| `self.distToPlayerSqXZ < 25` | player within 5 cells (squared distance) |
+| `turnTowardAngleY(self.angleToPlayer, 2deg)` | turn towards the player, 2° per frame |
+| `if (!self.animPlaying) animPlay(anim:N)` | loop an animation |
+| `wpFirst()`, `wpNext()`, `self.wpParam` | walk the waypoint chain; per-node parameter |
+| `g95 = g95 \| (1 << (v - 1))` | set an event bit that guards wait for |
@@ -0,0 +1,192 @@
+# Example: the roller coaster
+
+The *Llama Coaster* mod builds a new roller-coaster ride: a circuit with drops, climbs, boost
+arrows, a spin pad, a jump over a gap, a station where the ride starts and ends, and fireworks at
+the finish. Unlike the [arena](arena.md) it writes no new strat code: it **reuses the game's own
+coaster cart** (`RollerCoaster`) and only gives it new track data – new geometry and a new
+waypoint chain. This page explains how the original ride works and how the mod feeds it.
+
+![The ride: first drop, boost, jump, spin pad, climb, station](../img/strats/coaster_ride.jpg)
+
+| File | Role |
+|---|---|
+| [`CoasterMod.java`](../../src/main/java/com/eliasmueller/llamamod/mods/coaster/CoasterMod.java) | the mod: options, chapter check, writes the WAD and the loading picture |
+| [`CoasterTrack.java`](../../src/main/java/com/eliasmueller/llamamod/mods/coaster/CoasterTrack.java) | the two layouts; turns legs and pieces into segments, corners and the waypoint chain |
+| [`CoasterLevel.java`](../../src/main/java/com/eliasmueller/llamamod/mods/coaster/CoasterLevel.java) | the level script: track bed, rails, pillars, station, ground, objects |
+| [`CoasterSpeed.java`](../../src/main/java/com/eliasmueller/llamamod/mods/coaster/CoasterSpeed.java) | patches the cart's speed constants for the Speed option |
+| [`CoasterSim.java`](../../src/main/java/com/eliasmueller/llamamod/mods/coaster/CoasterSim.java) | frame-by-frame model of the cart, to check a layout without the game |
+| [`CoasterTest.java`](../../src/test/java/com/eliasmueller/llamamod/mods/coaster/CoasterTest.java) | unit tests |
+| [notes/mod-coaster.md](../../notes/mod-coaster.md) | lab notes: engine facts, what was verified in the game |
+
+Options: **track** (Loop ~100 units, Grand circuit ~150 units), **laps** (1–3, default 2),
+**speed** (slow / normal / fast), **coins** (on/off), TestLevel **chapter** (32–49, default 48).
+See [manual chapter 18](../manual/18-mods.md#the-llama-coaster-ride) for players.
+
+## 1. How the original ride works
+
+Catacombs chapters 1, 3 and 5 (`t1l7m001`, `t1l7m003`, `t1l7m005`) are roller-coaster rides. The
+ride music is track 25, `ROLLER` ([Music](../reference/audio.md#music)); the levels have the
+longest views of the game (fog end up to 23 cells, [Engine facts](../reference/engine-limits.md#drawing)).
+
+* **The cart is the player.** These levels have no `Llama` strat. The `RollerCoaster` strat calls
+  `isPlayer()` and draws `model:0` – the cart *with* Kuzco the llama and Pacha in it – so the llama
+  is not attached at run time, it is part of the cart model and its animations (lean, cheer, look
+  back). See [Objects](../reference/objects.md#special-objects).
+* **The camera** is the ordinary `Camera` strat, spawned by the cart like the Llama spawns it. It
+  follows the global `g29`; in a corner the cart sets `g29` to the heading *after* the turn, so the
+  camera swings round first.
+* **Track following**: the cart drives straight along its heading and turns by exactly 90° at a
+  waypoint. Its height comes from the floor under it. So a ride is a chain of straight legs on the
+  grid with 90° corners; slopes, jumps and gaps are pure geometry.
+* **Floor materials** of the track bed trigger the effects: 5 boost arrows, 11 jump, 13 spin pad
+  (the cart hops and turns round, riding backwards to the next corner), 16 the end, 30 the
+  invisible death plane below (fall = restart).
+* **Start and end**: the first waypoints are *station* nodes – the cart crawls out with letterbox
+  borders. On material 16, when the current waypoint is the last one, the strat waits 30 frames and
+  calls `endLevel` with its own parameters 1–3 (tribe, world, chapter) → the tally screen.
+* Helpers: `RollerDoor` (gates), `FireworksTrigger` (rockets at its waypoint spots when the cart
+  passes), `CoinRollerCoaster` (coins hovering over the track), `WompyRollerCoaster`.
+
+The river levels (`t1l3m001…4`) look similar but are not rail rides: their player
+`KuscoAndPachaTogetherOnATree` floats on water, is pushed by current zones, steers freely between
+the banks and leaves through a normal `LevelDoor`. That is why the mod uses the coaster.
+
+### The cart script step by step
+
+Excerpts of `RollerCoaster` as the editor's script view shows it (`v19` = speed, `v22` = boost
+excess, `v18` = sideways offset, `v21` = 0 or 2048 when riding backwards):
+
+```
+call L_0200()                       // prepare the waypoints:
+//   self.wpX = int(self.wpX * 2 + 0.5) / 2      x/z rounded to halves
+//   setWaypointParam2((self.wpRotY + 512) & 3072)  heading rounded to a quarter turn
+spawn<4, 41, 2, 0x248000, 0>(0.9, 1.0, 0, 0, unit:Camera)
+isPlayer()
+self.y = self.floorHeight
+showLevelStartInfo<1>()
+loop {
+    call L_0074()                   // the end check (below)
+    call L_012c()                   // left/right input → v18 (at most half the speed)
+    moveRightQ(v18)
+    moveForwardQ(v19)
+    if (v22 > 2r) { v19 -= 2r; v22 -= 2r }            // a boost wears off …
+    else if (v19 > 0.15) { v19 = max(v19 - 2r, 0.15) } // … down to cruise 0.15 (614 raw)
+    if (self.floorMaterial == 11) { … g22 = 163r }     // jump: vertical speed
+    else if (self.floorMaterial == 5) { v19 += 20r; v22 += 20r }   // boost arrows
+    else if (self.floorMaterial == 13) { … g22 = 61r; v20 = 128 } // spin: hop + half turn
+    if (self.y - 204r - v19 * 1228r < self.floorHeight && self.floorMaterial != -1) {
+        self.y = self.floorHeight    // stay on the floor (a climb > ~0.1 per frame is lost)
+    } else { … fall … }
+    // corner: within 0.75 of the waypoint, steer round it and take the next one
+    v15 = (self.x - self.wpX) * v4 + (self.z - self.wpZ) * v5
+    if (v15 < 0.75 | (self.wpParam && v15 < 2.0)) { … g29 = self.wpRotY … }
+    …
+}
+
+L_0074:                             // the end
+if (v13 > 1) { v13 -= 1; if (v13 <= 1) { endLevel(v1, v2, v3) } }
+else if (self.floorMaterial == 16 && (self.wpEndFlags & 3r)) { v13 = 30 }
+```
+
+## 2. The plan
+
+* **Base level = Catacombs 1 (`t1l7m001`)**, not the village: it already contains the cart, its
+  camera, coins, gates, fireworks, textures, sounds and the ride music. Importing them into the
+  village ([like the arena](arena.md#3-compiling-and-importing-arenaimport)) would only copy the
+  same things over. The mod keeps the base level's code and replaces geometry and objects.
+* The **track** follows the cart's rules: straight legs along the axes, 90° corners, heights
+  changing only on straights.
+* The **cart's waypoint chain** is generated from the same layout, so geometry and path cannot
+  disagree.
+* The level goes into a TestLevel chapter ([why 32–49](../reference/testlevel.md)).
+
+## 3. The track (`CoasterTrack`)
+
+A layout is a start corner and a list of legs; each leg is a heading and a list of pieces
+(kind, length in units, height change):
+
+```java
+new CoasterTrack("loop", new double[] {10, 10, 24}, List.of(
+    stationLeg(90, 4, 8, 4, 2),                         // run-in, END, brake, STATION, first drop
+    leg(0,   p(TRACK, 2), p(TRACK, 8, 2), p(TRACK, 2)),  // climb 2
+    leg(270, p(TRACK, 2), p(SPIN, 1), p(TRACK, 1), p(TRACK, 4, -2)),
+    leg(0,   p(BOOST, 2), p(JUMP, 1), p(GAP, 2, -1), p(TRACK, 9)),   // jump over a gap
+    leg(270, p(TRACK, 3), p(TRACK, 5, -2), p(TRACK, 2)),
+    leg(180, p(BOOST, 1), p(TRACK, 2), p(TRACK, 25, 7))));         // lift hill back up
+```
+
+The constructor lays the pieces out and refuses a layout that does not close, turns by anything
+but 90° or lacks exactly one STATION and one END on leg 0. Each kind maps to a floor material
+(TRACK 0, BOOST 5, JUMP 11, SPIN 13, END 16).
+
+![The two layouts in the editor's top view: Loop and Grand circuit](../img/strats/coaster_tracks.jpg)
+
+**Waypoints** (`nodes(laps)`): node 0 one unit behind the cart and node 1 at the end of the
+station, both with parameter 1.0 (the crawl); then one node per corner, 0.5 before its centre with
+the heading after the turn, repeated for every lap; and a last node 9 units past the END pad. So
+the END pad only ends the ride in the last lap – in earlier laps the cart rolls over it.
+
+## 4. The level (`CoasterLevel.build`)
+
+The level is a [`LevelScript`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelScript.java)
+for the [`LevelBuilder`](../../src/main/java/com/eliasmueller/llamamod/levelbuild/LevelBuilder.java):
+
+* **Track bed**: per unit two 1 × 1 quads with the piece's texture and material (boost arrows,
+  jump stripes, spin target), an underside, and **rails** 0.35 high on both sides – their inner
+  faces are collision walls, so steering cannot leave the track. Gaps get end faces.
+* **Corners**: flat 2 × 2 squares with rails on the two outer sides.
+* **Pillars** every 5 units and under each corner, a **boarding platform** with posts left of the
+  station, a **ground plane** at height 0 with material 30 (the death plane).
+* **Objects**:
+
+```java
+l.strat("RollerCoaster", st[0], st[1], st[2], st[3],
+        new int[] {0, tribe * FX, world * FX, chapter * FX},   // endLevel target = this chapter
+        LevelBuilder.Waypoints.of(wps), 0, false);
+l.strat("RollerDoor", …);                       // gate at the station exit
+l.strat("FireworksTrigger", …, Waypoints.of(fw), …);   // six rocket spots around the END pad
+l.strat("CoinRollerCoaster", …);                // every 1.5 units on long straights
+```
+
+## 5. Speed and checking a layout (`CoasterSpeed`, `CoasterSim`)
+
+The **Speed** option scales two constants of the cart: the cruise speed `pushShort 614` (six
+places: the floor after a boost and the cap in corners) and the boost `pushShort 20` (two places).
+`CoasterSpeed.find` locates them in the unit's listing (the instruction before and after must
+match) and rewrites only those 16-bit operands.
+
+A faster cart flies farther, and a jump that lands in a corner's turn zone misses the turn.
+`CoasterSim` replays the cart's speed and jump rules frame by frame on a layout and reports jumps
+that do not clear their gap or land too late, and climbs steeper than the floor probe allows.
+The tests run it for every track × speed × laps.
+
+## 6. The mod (`CoasterMod`)
+
+`apply` refuses a chapter whose WAD another mod (or a level project) already changed, builds the
+level on `t1l7m001`, sets the tally total to the number of coins (`LevelTally.counted`) and draws
+a loading picture in Java (the title sits in the band the tally text leaves free).
+
+![The tally after the ride](../img/strats/coaster_tally.jpg)
+
+## 7. How it was tested
+
+* **Unit tests** (`CoasterTest`): both layouts close, contain every feature and do not overlap;
+  bad layouts are refused; the waypoint chain follows the cart's rounding rules; every jump lands
+  for all speeds and laps; the speed patch changes exactly the 8 operands; the built level has one
+  RollerCoaster (and no Llama), the gate, the fireworks, the coins, the right exit target, the
+  floor materials 0/5/11/13/16/30 and the tally total; a chapter another mod wrote is refused.
+* **In the game** (`tools/apptest.py`): Loop and Grand circuit at all three speeds, 1 and 2 laps –
+  full rides from the station to the tally with a screenshot every 1.5 s, no crash. After the tally
+  Enter restarts the ride; in the ride Esc → *Beenden und zur Auswahlkarte wechseln* goes back to
+  the world map.
+
+## What to take from it
+
+1. **Reuse a ride type with new data** when its rules fit: a new geometry plus a new waypoint chain
+   is a new ride, without writing strat code.
+2. **Read the original strat first** – the 90° corners, the half-unit rounding and the 0.1 climb
+   limit all come from its script, and the layout code enforces them.
+3. **Generate path and geometry from one description**, so they always match.
+4. **Model the physics offline** (`CoasterSim`) to catch bad jumps before starting the game.
+5. **Constants can be tuned in place**: find them in the listing by their neighbours and patch the
+   operand, instead of recompiling the strat.
@@ -0,0 +1,87 @@
+# The script language
+
+LlamaMod's **script language** (version 2) is a small structured language in the style of the
+Script view. [`StratCompiler`](../../src/main/java/com/eliasmueller/llamamod/format/strat/StratCompiler.java)
+compiles it to strat assembly, and
+[`StratAssembler`](../../src/main/java/com/eliasmueller/llamamod/format/strat/StratAssembler.java)
+turns that into bytecode with the same checks as hand-written assembly. It is used by the editor's
+type editor (*Language: Script*) and by mods such as the [arena](arena.md). Complete reference:
+[notes/strat-language.md](../../notes/strat-language.md#script-language-stratcompiler--writing-new-behaviour);
+tests: `StratCompilerTest`.
+
+## A first strat
+
+```
+// bobs one cell up and down and turns
+strat Bobber {
+    alias base = v0
+    alias phase = v1
+    setModel(model:5)            // any opcode: name<inline operands>(stack arguments)
+    base = self.y + 1            // 1 = one cell
+    phase = 0
+    on touched {                 // event handler (type 4), runs as a subroutine
+        soundPlay(sound:6)
+    }
+    loop {
+        phase = phase + 4deg
+        self.y = base + sin(phase)
+        turnLeft(4deg)
+        yield                    // end of this frame
+    }
+}
+
+sub wobble {                     // called with "call wobble", ends with return
+    self.rotZ = sin(self.rotY) * 0.1
+}
+```
+
+## Building blocks
+
+| Construct | Notes |
+|---|---|
+| `strat Name { … }` | a type; its label `Name` is the entry point |
+| `sub name { … }`, `call name`, `return` | subroutines |
+| `alias name = v3` | a name for a variable; parameter names from the object schema are predefined |
+| `x = e`, `x += e`, `-=`, `*=`, `/=` | assignment; `x += 1` compiles to `inc` |
+| places | `vN`, alias, `gN`, `self.prop`, `player.prop`, `parent.prop`, `parent.vN`, `camera.` / `target.` / `boss.` / `dialog.prop` |
+| `if (c) { } else if (c) { } else { }` | |
+| `while (c) { }`, `loop { }`, `do { } while (c)` | a `yield` as the last statement of a loop becomes the loop's frame-ending back jump |
+| `switch (e) { case 1: … break  default: … }` | C rules (fall through without `break`); case values are constants |
+| `break`, `continue`, `yield`, `end`, `remove` | |
+| `on touched { … }`, `on event(type[, param]) [slot n] { … }` | event handlers; touched needs `collisionOn<…>()` and `collRadius(…)` |
+| `op<a, b>(e1, e2)` | **any opcode** by name: inline operands in `<>` (raw words), stack arguments in `()`; the count must match the opcode |
+
+### Numbers
+
+* `10` and `10.0` are ten cells (fixed point); `1.5`, `90deg` as in assembly.
+* **Raw** integers: `215r` (= 215/4096) or hex `0x10`. Values inside `<…>` are always raw.
+* Operators over constants are folded at compile time with the VM's own fixed-point rules:
+  `2 * 3 + 0.5` → `6.5`.
+* `use rawNumbers` switches to the version-1 rule (plain integers raw) – old scripts get it
+  automatically.
+
+### Operators (low → high precedence)
+
+`||` · `&&` · `|` · `&` · `==` `!=` · `<` `>` `<=` `>=` · `<<` `>>` · `+` `-` · `*` `/` · unary
+`-` `!`. In conditions `&&` / `||` short-circuit; in a value both sides are evaluated.
+
+### References
+
+`model:N`, `anim:N`, `unit:N[+off]` or `unit:Name` (another custom type), `sound:N`, `tex:N` –
+indices into the level the code is compiled against.
+
+## What the compiler does not do (yet)
+
+* no `for` loop, no typed variables (everything is a 32-bit word, fixed point by convention);
+* `spawn` takes raw type fields (`spawn<0, 16, 5, 0xC400, 3>(unit:…)`) – you must know the
+  values the spawned type needs;
+* the Script view does not show event handlers as `on … { }` blocks.
+
+## Tips
+
+* Look at an original type that does something similar first (Script panel) and copy its numbers
+  – speeds, animation indices, sounds and type fields are level-specific.
+* Keep each frame's work small and always reach a `yield` in loops; a loop without a yield freezes
+  the game.
+* Test in the game early: the compiler checks the code's form and references, not whether the
+  object behaves well.
@@ -0,0 +1,135 @@
+# Tools
+
+Everything in this repository that you can run, what it is for and where its code and notes are.
+None of the tools contain game data; they all work on your own copy of the game.
+
+## LlamaMod (Java app)
+
+The main product: a mod manager with a launcher and a 3D level editor, for Windows and Linux.
+Java 25 + Swing, sources in [`src/main/java/com/eliasmueller/llamamod/`](../src/main/java/com/eliasmueller/llamamod/).
+
+![The LlamaMod launcher](img/launcher.jpg)
+
+| Part | What it does | Docs |
+|---|---|---|
+| launcher | first-start wizard (copies the game from CD/ISO), mod list with options, save-game editor, starts the game (Wine on Linux) | [manual: Installing](manual/02-installing.md), [manual: Mods](manual/18-mods.md), [notes/llamamod-app.md](../notes/llamamod-app.md) |
+| level editor | 3D editor for new and original levels: brushes, tiles, meshes, textures, objects, waypoints, cameras, zones, lights, visibility, strat scripts, play-test, glTF export | [editor manual](manual/index.md) |
+| mods | Test World, Alligator Arena, level projects, Boot to level, Intro skip, Mirror mode, Practice tools, Randomizer, Draw distance, Built-in cheats, Debug wireframe, Free camera | [manual: LlamaMod mods](manual/18-mods.md), `notes/mod-*.md` |
+
+### Command line
+
+```text
+llamamod                        start the GUI
+llamamod --version              show the version and build id
+llamamod --install <iso|folder> set up the game data
+llamamod --mods                 list available mods and their options
+llamamod --apply [id,id,...] [--opt id.key=value ...]
+                                apply mods (none = original); options are saved
+llamamod --launch [--wait]      start the game
+llamamod --registry             show the registry values
+llamamod --saves                show save games
+llamamod --unlock <slot 1-3> <world> <chapter> [--cursor]
+llamamod --editor [project.llamalevel | t1l1m001]   level editor
+llamamod --editor-build <project.llamalevel> <out.wad> [--cd <dir>]
+llamamod --editor-import <level.wad|t1l1m001> <project.llamalevel> [--cd <dir>]
+llamamod --editor-new <project.llamalevel> [base level] [--name <name>] [--cd <dir>]
+llamamod --import-level <project.llamalevel>   (into the level folder, shown as a mod)
+llamamod --remove-level <id|file>   move a level mod's file to backups/levels/
+```
+
+Data folder: `-Dllamamod.data=<folder>` or `LLAMAMOD_DATA` (default `~/.local/share/LlamaMod`,
+Windows `%LOCALAPPDATA%\LlamaMod`). Source: [`Main.java`](../src/main/java/com/eliasmueller/llamamod/Main.java).
+
+### Debug view
+
+The *Debug wireframe* mod
+([`mods/debug/`](../src/main/java/com/eliasmueller/llamamod/mods/debug/)) adds visible geometry to
+every level: collision as coloured frames (invisible walls filled red, the exit floor violet, death
+planes magenta) and markers for invisible objects (start, exit, checkpoints, cameras, triggers,
+zones). Gameplay is unchanged. Its Python ancestor is `tools/debugviz.py`; colour legend and
+details: [notes/debugviz.md](../notes/debugviz.md).
+
+![Debug view in Village 3](img/debug-view.jpg)
+
+## Python kit (`tools/`)
+
+The reverse-engineering toolkit the project started with. Python 3.8+ with `numpy` and `Pillow`
+(`capstone` for `disx86.py`). All parsers rebuild the original files byte for byte.
+
+| Tool | Purpose |
+|---|---|
+| [`wadtool.py`](../tools/wadtool.py) | list, extract and replace WAD chunks |
+| [`geomlib.py`](../tools/geomlib.py) | library: WAD, TRAK, STPC models, MAP tile part, TEXT, collision |
+| [`geom_export.py`](../tools/geom_export.py) | level → OBJ/MTL with textures and vertex colours, `--collision` (collision.obj by material), `--objects`, preview renders |
+| [`geom_import.py`](../tools/geom_import.py) | OBJ → new world geometry in a copy of a level |
+| [`geom_demo.py`](../tools/geom_demo.py) | example geometry for `geom_import.py` |
+| [`mapchunk.py`](../tools/mapchunk.py) | MAP parser/writer |
+| [`map_dump.py`](../tools/map_dump.py) | print a level's tiles, strats, lights |
+| [`strats.py`](../tools/strats.py) | object types of a level: names, instance counts, code offsets, type fields |
+| [`strat_table.py`](../tools/strat_table.py) | type × level table → [notes/strat_types_table.md](../notes/strat_types_table.md) |
+| [`stpcwalk.py`](../tools/stpcwalk.py) | rough walk through STPC (models, animations, code) |
+| [`textchunk.py`](../tools/textchunk.py), [`text_export.py`](../tools/text_export.py) | TEXT chunk; export pages to PNG and import them back |
+| [`texsheet.py`](../tools/texsheet.py) | contact sheet of a level's textures with indices |
+| [`levelbuild.py`](../tools/levelbuild.py) | level builder from a Python script ([guide](guide/levels-in-code.md)) |
+| [`make_testlevel.py`](../tools/make_testlevel.py) | early experiment: one object per type on a floor plate |
+| [`debugviz.py`](../tools/debugviz.py), [`debugviz_check.py`](../tools/debugviz_check.py) | debug-view WADs for all levels and an offline check |
+| [`cor2png.py`](../tools/cor2png.py), [`png2cor.py`](../tools/png2cor.py) | loading pictures (COR) ↔ PNG |
+| [`asf2wav.py`](../tools/asf2wav.py) | music (ASF) → WAV, exact decoder |
+| [`disx86.py`](../tools/disx86.py) | disassemble `groove.exe` at a virtual address |
+| [`vorschau/`](../tools/vorschau/) | Blender (Eevee) preview renders of a level with labels |
+| [`lama-mod`](../tools/lama-mod) | shell script: CD overlay of symlinks for mods in a hand-made Wine setup (pre-LlamaMod) |
+
+Level scripts in [`levels/`](../levels/): `testwelt.py` (the original test world),
+`sprunglabor.py` (jump lab used to measure the llama), `testwelt_parkour.seq` (scripted run).
+
+### Paths
+
+The tools find the original game files through these environment variables
+([`tools/lamapaths.py`](../tools/lamapaths.py)); the defaults match a hand-made Wine setup.
+Command-line options (`--base`, `--src`, `--root`, `--iso`) win over them.
+
+| Variable | Used by | Default |
+|---|---|---|
+| `LLAMAMOD_CD` | `levelbuild.py`, `debugviz.py`, `debugviz_check.py`, Gradle tests (`-Dllamamod.cd`) | `$LAMA_WINEPREFIX/iso-dk/Setup/Eng/Cd` – the CD folder (`wads/`, `music/`, `*.cor`) |
+| `LAMA_WINEPREFIX` | `lamatest.py`, `levelbuild.py --install` | `~/.wine-lama` |
+| `LAMA_MOD` | `lamatest.py` | `~/.local/bin/lama-mod`, else `tools/lama-mod` |
+| `APPTEST_ROOT` | `apptest.py` (session folders) | `$CLAUDE_JOB_DIR/tmp` if set, else `~/.cache/llamamod-apptest` |
+| `APPTEST_ISO` | `apptest.py` (first install) | `~/Downloads/GROOVE_DK.iso` |
+| `LAMATEST_DIR` | `lamatest.py` (state, logs) | `/tmp/lamatest-$USER` |
+
+A missing folder stops the tool with a message naming the variable to set.
+
+## Testing in the game
+
+| Tool | What it does | Notes |
+|---|---|---|
+| [`tools/apptest.py`](../tools/apptest.py) | runs the game **through LlamaMod** in an isolated session: own data folder, Wine prefix, invisible X display (Xvfb), muted private PulseAudio; applies mods, unlocks a level, navigates the menus, presses keys, takes screenshots, detects crashes | [notes/llamamod-app.md](../notes/llamamod-app.md#testing-mods-in-game-toolsapptestpy) |
+| [`tools/lamatest.py`](../tools/lamatest.py) | the older harness for a hand-made Wine setup: loads a WAD as TestLevel and runs a key sequence | [notes/testharness.md](../notes/testharness.md) |
+
+Linux only; needs Wine, Xvfb, xdotool, ImageMagick, tesseract (German data, for reading menu
+texts) and PulseAudio. Session folders and the ISO: `APPTEST_ROOT`, `APPTEST_ISO` (see
+[Paths](#paths)).
+
+```bash
+./gradlew fatJar
+tools/apptest.py run demo --display 7 --mods arena --level 9 49 \
+    --seq "Up:1.5 shot:walk z shot:kick" --out /tmp/demo
+```
+
+## Reverse engineering
+
+* `re/ghidra_scripts/DumpAll.java` – headless Ghidra script that decompiles every function of
+  `groove.exe` into one C file. The exe, the decompile and (currently) the script itself are
+  excluded from the repository (`.gitignore`). Run
+  `analyzeHeadless <projdir> groove -import groove.exe -scriptPath re/ghidra_scripts -postScript DumpAll.java groove_decomp.c`
+  (Ghidra 12.x needs JDK 25).
+* Key functions: MAP loader `0x42ac50`, TRAK `0x42aac0`, STPC `0x42ab50`, strat VM `0x54d180`,
+  chunk dispatcher `0x558960`.
+
+## Other folders
+
+| Folder | Content |
+|---|---|
+| [`examples/`](../examples/) | `testwelt.llamalevel`: the original test world as an editor project |
+| [`packaging/`](../packaging/) | icons, Windows (launch4j) and Linux packaging files |
+| [`deb-build/`](../deb-build/) | older script (German) that builds a Debian package of the game itself from your ISO, with the soundtrack converted to MP3 |
@@ -0,0 +1,65 @@
+# Lab notes
+
+The project's engineering notebook: what was found in `groove.exe` and the game data, how each part
+of LlamaMod works, and what was verified in the game. The notes are detailed and technical (with
+addresses, confidence levels and test logs). For a readable introduction start with the
+[documentation](../docs/README.md) instead.
+
+Images used by the notes are in [`img/`](img/).
+
+## Formats and engine
+
+| Note | Topic |
+|---|---|
+| [geometry.md](geometry.md) | TRAK / MAP / STPC models, coordinate spaces, collision, visibility, writing new geometry |
+| [objects.md](objects.md) | MAP layout, strat records, waypoints, zones, special objects, the other chunks |
+| [textures.md](textures.md) | TEXT chunk |
+| [strat-opcodes.md](strat-opcodes.md) | all 434 strat VM opcodes, conventions, sources |
+| [strat-language.md](strat-language.md) | LlamaMod's strat assembly, script view and script language |
+| [strat_types_table.md](strat_types_table.md) | every object type in every level, with counts |
+| [editor-object-schemas.md](editor-object-schemas.md) | parameters of object types, guards, event bits, start camera |
+| [testlevel-chapters.md](testlevel-chapters.md) | world 9 chapters and the relocation patch |
+| [levelbau.md](levelbau.md) | the Python level builder, measured physics, the exit, the test world |
+| [debugviz.md](debugviz.md) | debug view: colour legend, how it is built |
+| [testharness.md](testharness.md) | `tools/lamatest.py`, PC controls |
+
+## LlamaMod app and mods
+
+| Note | Topic |
+|---|---|
+| [llamamod-app.md](llamamod-app.md) | build, CLI, data folder, registry, mod framework, exe patches, save games, `tools/apptest.py` |
+| [mod-arena.md](mod-arena.md) | Alligator Arena |
+| [mod-coaster.md](mod-coaster.md) | Llama Coaster (roller-coaster ride; how the original rides work) |
+| [mod-testworld.md](mod-testworld.md) | Test World and its gallery |
+| [mod-levels.md](mod-levels.md) | level projects as mods |
+| [mod-boottolevel.md](mod-boottolevel.md) | Boot to level |
+| [mod-introskip.md](mod-introskip.md) | Intro skip |
+| [mod-mirror.md](mod-mirror.md) | Mirror mode |
+| [mod-practice.md](mod-practice.md) | Practice tools |
+| [mod-randomizer.md](mod-randomizer.md) | Randomizer |
+| [mod-fog.md](mod-fog.md) | Draw distance |
+| [mod-cheats.md](mod-cheats.md) | Built-in cheats |
+| [mod-freecam.md](mod-freecam.md) | Free camera & noclip |
+
+## Level editor internals
+
+| Note | Topic |
+|---|---|
+| [editor-design.md](editor-design.md) | design brief |
+| [editor-api.md](editor-api.md) | scene model, commands, IO |
+| [editor-format.md](editor-format.md) | the `.llamalevel` project format |
+| [editor-render.md](editor-render.md) | OpenGL viewport, coordinate conventions, culling |
+| [editor-ui.md](editor-ui.md) | application shell and plugin API |
+| [editor-tools-geometry.md](editor-tools-geometry.md) | brushes, tiles, collision, mesh import, library |
+| [editor-tools-objects.md](editor-tools-objects.md) | objects, paths, cameras |
+| [editor-tools-environment.md](editor-tools-environment.md) | zones, fog, music, lights, visibility, baking |
+| [editor-tools-textures.md](editor-tools-textures.md) | texture manager, import, painting, animations |
+| [editor-cross-import.md](editor-cross-import.md) | importing object types from other levels, engine limits |
+| [editor-playtest.md](editor-playtest.md) | play-test straight into the level |
+| [editor-manual.md](editor-manual.md) | the manual window and context help |
+| [editor-guide.md](editor-guide.md) | early short user guide (superseded by [docs/manual](../docs/manual/index.md)) |
+
+## Process
+
+[`dev/`](dev/) holds the briefs for the AI agents that worked on the project and the review reports
+of the overnight UX and bug reviews (`bug-review-*.md`, `ux-review-*.md`).
@@ -60,7 +60,7 @@ objdump, replay, restore).
 After rebasing onto the merged main tree (simp-all + launcher UX changes): orig, all-v, boot-exe, mrf-r
 re-run with the final jar: all OK (CDPath `L:\cd-active\`).

-![matrix](img/launcher-matrix.jpg)
+![matrix](../img/launcher-matrix.jpg)

 Screens: all mods in Village (wireframe, mirrored) and the free camera; River with mirror+randomizer+fog;
 Test World with all mods; boot-to-level + all exe mods (River loading card); practice restore.
@@ -14,20 +14,20 @@ position) started straight in the level, and Escape in the game returned to the

 | Before | After |
 |---|---|
-| ![](img/editor/ux_llama_before.jpg) | ![](img/editor/ux_llama_after.jpg) |
+| ![](../img/editor/ux_llama_before.jpg) | ![](../img/editor/ux_llama_after.jpg) |
 | A 1920-wide window: the Inspector is 170 px wide and shows no values at all. Side docks have two rows of tabs. | The docks get their intended widths (290 / 340 px). Side-dock tabs are icons with the active one named. The engine fields of the object type are folded away. |
-| ![](img/editor/ux_brush_before.jpg) | ![](img/editor/ux_brush_after.jpg) |
+| ![](../img/editor/ux_brush_before.jpg) | ![](../img/editor/ux_brush_after.jpg) |
 | The Brush tool's buttons read "Bl…", "Pl…", the texture names "gr…", the numbers show "0,5". | Full labels and a decimal point. |
-| ![](img/editor/ux_coin_before.jpg) | ![](img/editor/ux_coin_after.jpg) |
+| ![](../img/editor/ux_coin_before.jpg) | ![](../img/editor/ux_coin_after.jpg) |
 | The Coin tool's options are cut off: only the top pixels of the fields are visible. | The options are on one line, or wrap to a second row in narrow windows. |
-| ![](img/editor/ux_menu_before.jpg) | ![](img/editor/ux_menu_after.jpg) |
+| ![](../img/editor/ux_menu_before.jpg) | ![](../img/editor/ux_menu_after.jpg) |
 | *Help* comes before *Geometry*, and the shortcuts are German ("Strg", "Umschalt"). | The menus are File … Geometry, Tools, Help, and the keys are named "Ctrl", "Shift". |
-| ![](img/editor/ux_orig_before.jpg) | ![](img/editor/ux_orig_after.jpg) |
+| ![](../img/editor/ux_orig_before.jpg) | ![](../img/editor/ux_orig_after.jpg) |
 | *Open original level*: the description is cut at the right edge, and the selected row's id is grey on orange. | The text wraps and the id is readable. |
-| ![](img/editor/ux_small_before.jpg) | ![](img/editor/ux_small_after.jpg) |
+| ![](../img/editor/ux_small_before.jpg) | ![](../img/editor/ux_small_after.jpg) |
 | A 1280×720 window: the right dock is squeezed to 130 px. Also, Esc did not close the dialog, so it was still open and blocked every key. | The docks keep their sizes and the tool options wrap. Esc closes dialogs. |

-![](img/editor/ux_quit_game.jpg)
+![](../img/editor/ux_quit_game.jpg)

 *New: Play while the game still runs offers to quit it.*

@@ -20,27 +20,27 @@ covered by code review), Windows (the antivirus notice is unchanged there).

 | Before | After |
 |---|---|
-| ![](img/app/ux_start_before.jpg) | ![](img/app/ux_start_after.jpg) |
+| ![](../img/app/ux_start_before.jpg) | ![](../img/app/ux_start_after.jpg) |
 | The app opens with the mod list scrolled to the end (Visual, Cheats); Levels and Gameplay are out of sight. | The list opens at the top and keeps its place when it is rebuilt (Apply, theme). Short windows get a lower header. |
-| ![](img/app/ux_mods_before.jpg) | ![](img/app/ux_mods_after.jpg) |
+| ![](../img/app/ux_mods_before.jpg) | ![](../img/app/ux_mods_after.jpg) |
 | Options have no explanation unless you hover (Worlds "all"? Checkpoint spacing "10" of what?). Descriptions talk about "far clip plane", "strafe", "rigid object models". | Every option is explained next to it. Mod descriptions say what happens in the game and which keys to press. |
-| ![](img/app/ux_wizard_before.jpg) | ![](img/app/ux_wizard_after.jpg) |
+| ![](../img/app/ux_wizard_before.jpg) | ![](../img/app/ux_wizard_after.jpg) |
 | A text file is "shorter than expected (truncated?)", a wrong folder gets "expected Setup/…/Hd/groove.exe", a half-downloaded ISO is "Game found" and fails only after Set up. | Plain messages that say what to do; an incomplete ISO is caught at once, with both sizes. |
-| ![](img/app/ux_exe_before.jpg) | ![](img/app/ux_exe_after.jpg) |
+| ![](../img/app/ux_exe_before.jpg) | ![](../img/app/ux_exe_after.jpg) |
 | On Linux a missing groove.exe is blamed on antivirus software and explained with Windows Defender menus. After Rebuild you have to click Play again. | Linux gets a short message; **Rebuild** writes the file and starts the game. |
-| ![](img/app/ux_saves_before.jpg) | ![](img/app/ux_saves_after.jpg) |
+| ![](../img/app/ux_saves_before.jpg) | ![](../img/app/ux_saves_after.jpg) |
 | "lowest 4 bits of the coin count", "unknown item flag (bit 0)", "Cursor on", "Revert"; no hint how to restore a backup. | Plain wording, "Opens at", "Undo changes"; **Import…** starts in the backups folder and the hint says so. |
-| ![](img/app/ux_settings_before.jpg) | ![](img/app/ux_settings_after.jpg) |
+| ![](../img/app/ux_settings_before.jpg) | ![](../img/app/ux_settings_after.jpg) |
 | "registry values ScreenW/ScreenH", "wine from PATH"; the mod cache shows 0.0 MB after applying 6 mods (stale). | "Automatic (1920x1052)" shows the real size, plain hints, a note on what *Set up again* keeps; the cache size is current. |
-| ![](img/app/ux_dark_before.jpg) | ![](img/app/ux_dark_after.jpg) |
+| ![](../img/app/ux_dark_before.jpg) | ![](../img/app/ux_dark_after.jpg) |
 | Dark theme: the *modifies groove.exe* badge is dark orange on grey (barely readable). | A lighter badge text in the dark theme. |

 | New: quitting a hidden or hung game | New: crash report |
 |---|---|
-| ![](img/app/ux_quit_after.jpg) | ![](img/app/ux_crash_after.jpg) |
+| ![](../img/app/ux_quit_after.jpg) | ![](../img/app/ux_crash_after.jpg) |
 | While the game runs, Play becomes **■ Quit game** (neutral colour) with a confirmation. | Shown as soon as Wine reports the crash (the game hides behind Wine's error window until that is closed), with Quit game / Open logs. |

-![](img/app/ux_av_linux_before.jpg)
+![](../img/app/ux_av_linux_before.jpg)

 *Before: on Linux every first Apply of an exe mod showed this Windows Defender notice. Now it is
 shown on Windows only.*
@@ -114,7 +114,7 @@ Kinds FLOOR, BOX, PLATFORM, PILLAR, RAMP, STAIRS, FENCE, TREE, SEA, KILL_PLANE,
 – the `levelbuild.LevelBuilder` primitives; parameters = props named as in `BrushKind.params()`
 (`Param(name, label, type, default, role, choices)`; role X/Y/Z/XZ_LIST/XYZ_LIST/XZ_RECT marks
 coordinates). `brush.bounds()` gives an approximate box. Texture parameters: village names
-(`LevelBuilder.TEX`), `"#index"`, flat colour names (`LevelBuilder.FLAT`) or `"rgbRRGGBB"`.
+(`LevelBuilder.TEX`, resolved per base by `BaseTextures`), `"#index"`, flat colour names (`LevelBuilder.FLAT`) or `"rgbRRGGBB"`.
 For a preview of the generated geometry: `BrushCompiler.compile(scene, warnings)` → generated
 `TileModel`s/`Tile`s/textures (same as the build).

@@ -151,7 +151,9 @@ vertex colours tint the lighting.
 * Meaning of many raw fields is unknown (`unk*` props of zones/waypoints, texture entry flags,
  collision groups B/C, region value) – they are editable but not interpreted.
 * Tile swaps (WFPC 0x10000) can only exist in bases with that flag.
-* Texture names exist only for the village (levelbuild names); other levels use `#index`.
+* Texture names are the village's levelbuild names; on other bases they resolve to the same picture
+  (`levelbuild.BaseTextures`, pixel fingerprint); names the base lacks are not offered (GeoWidgets) and a
+  brush using one is skipped with a warning (the editor has no CD access to copy them over).
 * Lights: types other than 1/2/4 carry no data and are ignored by the engine.
 * Removing original tiles shifts tile indices used by strat scripts (see editor-format.md).
 * The engine limits: ≤ 8000 vertices per tile model, collision within ±8 of the tile origin
@@ -5,7 +5,7 @@ Code: `src/main/java/com/eliasmueller/llamamod/editor/tools/environment/`, tests
 `src/test/.../editor/tools/environment/` (`EnvironmentToolsTest` needs `-Dllamamod.cd`; `EnvTour`
 = scripted screenshots, `EnvScenarios` = the in-game test projects).

-![zones](img/editor/env_zones.jpg)
+![zones](img/editor/env_zone.jpg)

 ## What the user gets

@@ -68,6 +68,31 @@ stein, stein_kante, stein_moos, platte, holz_dunkel, holz_maser, holzbalken, rin
 inka, muster_lila, …`), a direct index (int) or a flat colour (`'meer'`, `'rot'`, … or
 `(r,g,b)`; appended to the texture table as a flat-colour entry (flags 0x105, page −1)).
 Contact sheet with indices: `notes/img/texturen_dorf.png`.
+
+**Texture names on other bases** (2026-11-07). The `TEX` indices are village (t1l1m001) indices; on another
+base the same index is a different picture (village 2: index 1 = dark red floor). Names are therefore
+resolved per base by picture: `levelbuild.BaseTextures` holds a fingerprint (FNV-1a over page format,
+size and pixels of the entry's rectangle) of every named village texture; a name maps to the village index
+if the base shows that picture there (village 1: always → outputs unchanged), else to the first base entry
+with the same picture (flags 0x104 preferred). Coverage of the 47 names: t1l1m002 38 (missing: the three
+flower textures, `wood_grain*`, `wood_brown*`, `wood_rings`, `wood_edge`), t1l1m003 29, t1l1m004 28,
+t1l2m001 9, t1l3m001/t1l5m001 0–2.
+* Java builder (`LevelBuilder`, test world/arena/jump lab, `fromCd`): a missing picture is **copied from the
+  village** (CD file loader `wads/t1l1m001.wad`): packed onto a new 256×256 page (same page flags, 1 px
+  clamped border) and appended as an entry after the base table; flat colours and copies share the
+  appended range in order of first use. Without a loader (editor brushes: `BrushCompiler` passes none)
+  the name is rejected: "texture 'flowers' is a village texture this base level does not have …"
+  (the editor shows that as a brush warning and only offers the names the scene's base has).
+  `LevelBuilder.baseTextureNames()` lists the names a base has.
+* Python `tools/levelbuild.py --base`: same matching (md5 of RGBA rectangle); missing names raise a
+  KeyError (no copying).
+* In game (apptest, display :22, 2026-11-07): Java-built level on t1l1m002 (grass box, stone box, sand,
+  trees, plus copied `flowers`, `wood_rings`, `wood_grain`), `--editor-import` → level mod, Village
+  chapter 2: grass green, stone grey, trees bark + leaves, copied textures correct
+  (`notes/img/editor/village2_levelbuild_textures.jpg`, `…_textures2.jpg`). Before: grass = dark red
+  (`village2_levelbuild_start_camera.jpg`).
+* Editor (display :22): on a t1l1m002 scene the brush swatches and the texture grid show the base's own
+  pictures for the names, without the names it lacks (`notes/img/editor/village2_texture_picker.jpg`).
 **Every triangle shows a whole texture tile** (the engine has no free UVs) – so
 everything is split into 1×1 pieces; narrow/flat walls show the texture squashed.

@@ -148,6 +173,11 @@ stairs, platforms register as shadow casters (`solids`). 1.0 = texture colour

 ## Exit (LevelDoor) – how it works

+> **Corrected 2026-11-07 (in game, Jungle Day 2):** the listing below was the first reading. The
+> LevelDoor only sets g101–g105 and checks global 0x21 *once*; the level is ended by the **Llama's
+> script** (material 16 + exit cell + at most ~0.6 above the floor). See "Exit via stale floor
+> material" further down and docs/reference/objects.md.
+
 Strat bytecode (village, STPC 0x430332, 3 parameters, invisible, no model), decoded via the
 VM `FUN_0054d180` (opcode < 0x45: table 0x5796bc with 16-bit operand, otherwise 0x578ff4+op·4):
 ```
@@ -174,6 +204,46 @@ loop:  if g21 == 3                    ; game state "running"
  (zone teleport). t1l3m003: 2 of the 4 doors (cells 71,48/71,49) have no pad at all.
 * Second path (strat code at 0x4252aa, player logic [likely]): floor material 16 and cell =
  g104/g105 (set by the LevelDoor at start, Llama sets them to −1) → level change(g101..g103).
+
+### Exit via stale floor material (hover + position jump, t1l4m002) – checked 2026-11-07
+
+Speedrun video (position/hover hack): Kuzco hovers above a house-door stump, is moved to the exit and
+the level ends. Reproduced in game (apptest, gdb through `winedbg --gdb`, position written by gdb):
+* **Jungle Day chapter 2 = t1l4m002** (LNFO 95 coins / 2 secrets; tally "Dschungeltag Kapitel 2,
+  0/95, 0/2"). LevelDoor at 44.5/25.5 (cell 44,25), params (1,4,3); RubyIdolDoor in the same
+  cell. Cell 44,25 (tile 255) has material 16 **only in swap model 95** (pad x 44.67–45.0,
+  z 25.25–25.75, y 2.25); main model 94 has none → with the door closed the exit cannot fire.
+  House-door pads (material 16, main models) in cells 38,20 / 51,0 / 52,5 / 41,24 / 44,27 /
+  50,27 / 41,29 / 57,55 / 41,38 / 41,44 plus swap pads in 22,21 / 26,21 / 23,23 / 50,1 / 43,21 /
+  46,30 / 58,49 / 31,50; the zones pair them (e.g. 44,27 → 50.5/27.5, 50,27 → 44.5/27.5).
+* **Floor test (FUN_004036d0):** only tiles of the player's own cell; per upward polygon the plane
+  height at (x,z) is compared with a probe point (y + 0.25, or y + (floor record +0x18)/2 with
+  +0xe8 flag 0x200000 as for the llama);
+  the **nearest floor below the probe wins, with no distance limit**. Material 17 is skipped for
+  the llama (+0xe8 = 0x24882a, no 0x8000000). If nothing is below: for the llama (+0xe8 & 0x40000)
+  material/height are **not** updated (stale) and x/z go back to the previous position.
+  In game: llama held at 44.9/**6.0**/27.5 (3.7 above the pad of the stump at 44,27) → floor
+  record h 2.30, **material 16**, tile 282 poly 15, every frame.
+* **Order per tick (FUN_0054c4a0):** all strat scripts (VM FUN_0054d180) first, then the
+  collision pass (FUN_00403020 for every strat with +0xe8 & 0x8000). A position written after the
+  collision pass is seen by the scripts of the next tick with the **old floor record**.
+  In game: after hovering above the 44,27 pad, llama set to 44.5/2.3/25.5 right after its floor
+  test → next event endLevel `FUN_0054d620` (called from the VM, floor record still 16), before
+  any new floor test → tally (twice with screenshot, once traced). Control: same jump from normal
+  ground (material 0) → no exit; jump written just *before* the floor test → record becomes 0, no exit.
+* **Who ends the level here: the Llama, not the LevelDoor.** LevelDoor bytecode: wait 5 ticks,
+  g101..g105 = params + cell, then **once** `if global 0x21 != 3 → end` (so "g21 == 3" above is a
+  one-time check, and global 0x21 is not the game state 0x5846e4), then the per-tick loop. In
+  t1l4m002 the LevelDoor was gone from the strat list (scan of 0x6d9e38) while g101..g105 =
+  1,4,3,44,25 and global 0x21 = 0. The Llama block at STPC 0x39ff4c–0x3a0064: if floorMaterial
+  == 16 and health > 0 and (y < floorHeight + 0.6 and global 0x21 != 2, or y < floorHeight + 0.025
+  and (g1 == 0 or global 0x23)): cell == (g104, g105) → level change(g101..g103), else fade-out +
+  `getDoorPos` (op 0x100, zone teleport = house door) + `forceCollision`. The 0.6 limit is why
+  hovering high above a house pad does not trigger the house teleport (bytecode; not separately
+  tested), while landing at floor height in the exit cell with the stale record does.
+* Not explained: in two sessions with a moved player start (boot-to-level `start` 43.3/25.5) the
+  same jump did not end the level (Llama script ran with record 16 in cell 44,25, no endLevel).
+* Images: `img/debug/exit-hover-trick.jpg` (top: video; bottom: our pool/door platform, tally).
 * Parameters in the originals: (1, world, chapter+1) = next chapter; in the last chapter of a
  world **(7,7,7)** = "world completed" → back to the selection map, unlock the next world.
 * `FUN_0054d620`: remembers the current level (0x585008..14), sets the next (0x584eb4/b8/bc), shows the
@@ -190,6 +260,9 @@ loop:  if g21 == 3                    ; game state "running"
  49 chapter slots, table 0x572420) and calls `lama-mod an`. For this, `lama-mod` now also takes
  symlinks from mod folders (`find … -type f -o -type l`). Checked: chapter 2 on the map is
  selectable and loads the test world.
+* **Only chapters 1 and 32–49 are safe** for world 9: the per-chapter coin counter and flag byte of
+  the other chapters overwrite game globals (chapter 9 destroys the furthest progress), see
+  [testlevel-chapters.md](testlevel-chapters.md).
 * The selection map shows no background for world 9 (only text) and 772 as the coin target
  (coin table 0x5722f4 only has worlds 1–8) – cosmetic.

@@ -121,9 +121,10 @@ Each contains `68 90 E0 56 00` (push offset subkey string, VA 0x56E090) followed
 byte `02` of each `push 80000002h` becomes `01` (HKEY_CURRENT_USER), so no admin rights are needed
 on Windows. German CD (`groove.exe` MD5 697d67a31c20079838c662d8187dbd86, 1,642,496 bytes),
 file offsets of the changed bytes: **0x579B, 0x57D0, 0x5810, 0x5859, 0x5880** (original 02,
-new 01; patched MD5 6199a42eb7582b2a70b1ac6e29f00f43). The patcher searches the pattern
-(push of the subkey string VA + push HKLM) instead of fixed offsets, so other language builds work
-if their code is the same.
+new 01; MD5 with only this part 6199a42eb7582b2a70b1ac6e29f00f43; the base patch also relocates the
+world-9 level records, see "groove.exe patches" below). The patcher searches the pattern
+(push of the subkey string VA + push HKLM) instead of fixed offsets; the English build has the
+changed bytes at the same file offsets. Supported builds: see "groove.exe versions" below.

 File lookup (FUN_00415690): tries `HDPath\dir\file`, then `CDPath\dir\file` (checked with
 `_access`), and only then loops over drive letters with `GetDriveTypeA == DRIVE_CDROM`. A plain
@@ -222,8 +223,11 @@ reads a CD folder, collects writes in `ctx.written`, resolves options (defaults

 `game/groove.exe` is rebuilt on every apply: `original/hd/groove.exe` → HKCU base patch
 (`platform/ExePatcher`, owner "base", always first) → exe changes of the enabled mods in apply
-order. Without exe mods the result is byte-identical to the old ExePatcher output; "Restore
-original" goes back to it. A mod gets the shared image with `ctx.exe()`; all changes are
+order. Without exe mods the result is byte-identical to `ExePatcher.patch` (installer output);
+"Restore original" goes back to it. The base patch (REVISION 2) = HKCU + `relocateLevelRecords`
+(world-9 coin/flag arrays moved into .data's page slack – English build: .rdata's page slack, and
+.rdata's section flags get the write bit, because its .data slack is only 43 bytes; 4-byte address
+operands only, see testlevel-chapters.md); `ExePatcher.changes` lists both as byte runs. A mod gets the shared image with `ctx.exe()`; all changes are
 attributed to the mod id, journaled into the mod's cache manifest (`"exe": [...]`) and replayed
 (with full verification) on a cache hit. Every patch/allocation is logged in apply.log
 (`exe <mod>: patch 0x… n bytes – label`).
@@ -267,6 +271,58 @@ in cave code are fine). Tests: `exe/ExeImageTest` (real exe, re-parse + `objdump
 `mods/ModOptionsAndExeTest`; in-game check: `mods/ExeSmokeMod` (test classes, see below; its call
 counter is an `allocateData` block).

+### groove.exe versions (`exe/GameExe`, `exe/Site`)
+
+Two builds are supported; their code is the same but shifted, and the .data globals are laid
+out differently, so **no patch uses a fixed address**:
+
+| Build | PE date | Size | SHA-256 |
+|---|---|---|---|
+| German (reference, all RE notes) | 2001-02-12 | 1,642,496 | `7832eda4ee47a717e94441f21b75a9f30d11445c9f2408c6135a8fc01812e95b` |
+| English first release ("Start Game", "Chapter") | 2000-10-17 | 1,634,304 | `bf0eb8829ed3e371c4e951ece0a7753acf2c28d07001b842e079b098576403b0` |
+
+`exe.game()` (a `GameExe`, cached per `ExeImage`) identifies the build by SHA-256 (`build()`,
+`describe()` – logged in apply.log as `groove.exe: English version of 2000-10-17`) and resolves
+each named `Site` on the file **as parsed** (before any patch): `va(site)`, `original(site, n)` =
+the original bytes there (expected bytes for `patch`/`hookCall`, and the stolen bytes a detour
+re-emits, e.g. the frame handlers' `mov eax,[global]`). Rules in `Site`: `code(sig)` = unique
+match in .text, `??` masking absolute addresses and rel32 operands; `operand(sig, off)` /
+`operandAt(site, off)` = the absolute address an instruction uses (must lie in .data – globals
+are always read from code, never guessed); `callTarget(site)` = target of a call; `.calling(s)`
+also checks that the call at the site goes to `s`. Each site lists its German and English VA:
+`exe/GameExeTest` checks that both builds resolve to them and that every site disassembles
+(objdump) to the expected instruction; `mods/ExeVersionsTest` checks that the German output of
+every exe mod and option set is **byte-identical** to the output before the version layer (SHA-256
+golden values) and that every mod makes the same patches in the English exe;
+`ExeModCombinationsTest` runs all combinations on both. The English exe is read from
+`-Dllamamod.exeEn` (default `re/groove_en.exe`, gitignored – never commit it or add it to test
+resources); tests skip without it.
+
+An unknown build fails on the first site that does not match exactly once, e.g.
+`groove.exe (unknown version (PE date …, … bytes)): MENU_FRAME (state 2 (main menu) frame handler …)
+not found – unknown program version. LlamaMod supports: German version of 2001-02-12, English
+version of 2000-10-17.` The base patch stays lenient (HKCU by pattern, relocation skipped).
+The mod cache key includes the exe hash for every build except the German one (whose keys did
+not change).
+
+**In game** (apptest :25, 2026-11-07, English exe in `original/hd` with the **German CD data** –
+the English exe runs with it; menus are English because the strings are in the exe): main menu
+without logos after 17 s and no attract demo after 100 s (intro skip); boot to level (Village 2,
+TestLevel 9); practice F5/F8 restores the position; free camera F7 flies away from the llama;
+cheats: winedbg showed cheat flags 0x583DA0 = the chosen bits, energy 0x584500 stayed 0x5000
+after falls into water with `health`, dropped to 0x4000 without it; TestLevel chapter 9 → "Quit to
+Map Select" gives a sane map (Village / Chapter 1 / 55) instead of the broken progress.
+![English exe: menu, practice restore, free camera, map after TestLevel 9](img/mods/english_exe.jpg)
+
+**Adding a build:** copy it to `re/` (gitignored), add a `GameExe.Build` (language, PE date, size,
+SHA-256), run `GameExeTest`: every failing site needs a longer/other signature (keep it unique in
+all builds; mask only addresses and rel32). For the new column, read each address off the
+resolved sites (or with a script that pairs relocation entries of matched instructions, as done
+for the English build: an operand is accepted only if most references to the German global agree),
+then add the column to `Site` and a case to `Build.va`. Check the base patch's free space
+(`ExePatcher.SLACK_SECTIONS`) and run `ExeVersionsTest` / `ExeModCombinationsTest`; then test in
+game.
+
 ### Antivirus false positives

 A changed groove.exe with extra code may be flagged by antivirus programs (Windows Defender).
@@ -313,7 +369,9 @@ Decoded from FUN_0041c640 (load) / FUN_0041c820 (save); details in `save/Ksv.jav
 | 0xD0–0xD9 | options: effects volume, music volume, 0x80, speaker mode, 6 more option bytes |

 Chapters per world (table 0x572420): 4, 3, 4, 3, 3, 3, 5, 5, 49. World 9 has no row in the
-per-chapter arrays. The KSV files shipped on the CD are empty (0x00 then 0xCC). Selecting an empty
+per-chapter arrays. Its coin counter/flag byte for chapters 2–31 land on other globals (chapter 9 =
+furthest progress): mods use only chapters 1 and 32–49 (`save/TestLevelChapters`,
+[testlevel-chapters.md](testlevel-chapters.md)). The KSV files shipped on the CD are empty (0x00 then 0xCC). Selecting an empty
 slot and "new game" immediately writes a zeroed file.

 ## Tests done (2026-11-06)
@@ -354,9 +412,9 @@ On real hardware no wrapper should be needed (unverified).
 Runs the game through the LlamaMod app (fat jar CLI), invisible and muted, one isolated *session*
 per name: own data folder (`<root>/<name>/data`, = LLAMAMOD_DATA, own Wine prefix and save games),
 own Xvfb display, own PulseAudio daemon with only a null sink (PulseEffects on the desktop steals
-streams from null sinks on the main server). Root: `$APPTEST_ROOT`, default
-`/home/elias/.claude/jobs/90c6eed7/tmp`. The original game data is installed once from
-`~/Downloads/GROOVE_DK.iso` into `<root>/_llamamod-template` (file lock, so parallel agents wait)
+streams from null sinks on the main server). Root: `$APPTEST_ROOT`, else `$CLAUDE_JOB_DIR/tmp`
+(AI agent sessions), else `~/.cache/llamamod-apptest`. The original game data is installed once from
+the ISO (`--iso`, `$APPTEST_ISO`, default `~/Downloads/GROOVE_DK.iso`) into `<root>/_llamamod-template` (file lock, so parallel agents wait)
 and hard-linked into each session (~30 MB per session + ~200 MB Wine prefix on first start).
 `~/.wine-lama` and the user's own game are never touched.

@@ -11,11 +11,12 @@ Registered in `ModRegistry` (one line). Test-only: `ArenaTestMod` (src/test, scr
 | `waves` | 3 (1–5) | wave n has min(n, 2) alligators (3 waves = 5 alligators) |
 | `energy` | 4 (1–5) | llama energy cap (5 = game normal) |
 | `coins` | 1 (0–5) | EnemyCoins per hit (+5 on defeat, +5 bonus at the exit) |
-| `chapter` | 8 (2–8) | TestLevel chapter; a chapter already written by another mod → apply error |
+| `chapter` | 49 (32–49) | TestLevel chapter; a chapter already written by another mod → apply error; a stored 2–8 falls back to 49 |

-Chapter ≤ 8 on purpose: `levelRecord` (coin counter) lives at `0x584F1C[world·6 + chapter]`; for
-world 9 chapter 9 that is 0x585018 = furthest progress (unverified risk for level projects on
-chapters ≥ 9, see "Issues").
+Only chapters 32–49: the coin counter `0x584F1C[world·6 + chapter]` and the flag byte
+`0x584EC8[…]` of world-9 chapters 2–31 overwrite other globals (chapter 8 = last played map,
+chapter 9 = furthest progress – verified, see [testlevel-chapters.md](testlevel-chapters.md)).
+The tally total (LNFO) is 2 placed coins + alligators · ((lives − 1) · coins + 5) + 5 bonus.

 Script options (`Arena`, tests/`ArenaTestMod`): `probe=true` (event probe 1.6 ahead of the llama),
 `master=false` (no alligators), `start=x,z,rot`, `debug=true` (HUD coin counter shows
@@ -72,7 +73,9 @@ per type (nVars/slots/typeFlags/extra), then `LevelBuilder` builds the level.
 * `spawn` copies the strat's matrix/translation block, not `x/y/z`: after `self.x = …` the child
  appears at the old place unless the spawner yields first.
 * Energy 0: the game's "Weiter / Beenden" screen; Weiter restarts the level (all strats fresh).
-* The level tally after the exit shows "Münzen gesammelt 0 / 55" (not our coin counter).
+* The level tally after the exit showed "Münzen gesammelt 0 / 55" on chapter 8: 0 = the coin slot
+  after endLevel wrote the last played map into it, 55 = LNFO of the Village base. Fixed: chapter
+  32–49 and recounted LNFO ("2 / 12" for 1 alligator with 1 life).

 ## Verified in game (apptest :24, Wine 6, load 3–9, 2026-11-07)

@@ -101,7 +104,6 @@ mod's chapter → IOException; probe option.

 ## Issues / limits

-* Loading picture and tally use the TestLevel texts ("TestLevel Kapitel 8").
+* Loading picture and tally use the TestLevel texts ("TestLevel Kapitel 49").
 * The exit target is the arena itself (1, 9, chapter): it restarts after the tally.
-* Level projects on TestLevel chapters ≥ 9 may write the coin counter over furthest progress
-  (0x585018) – not verified.
+* Exiting chapter 49 unlocks "chapter 50" (progress 9/50); the map caps the cursor at 49 (checked).
@@ -57,7 +57,7 @@ diagnostics) → `jmp 0x41C050`. The cave writes only game globals, so it needs

 | Feature | State | In the mod |
 |---|---|---|
-| `-display_diagnostics` (DAT_005834D0) | works: writes `<COMPUTER>.dispdiag` (DDraw/D3D enumeration) into the game folder | option `diagnostics` (tested: ELIASPC.dispdiag, 60 KB) |
+| `-display_diagnostics` (DAT_005834D0) | works: writes `<COMPUTER>.dispdiag` (DDraw/D3D enumeration) into the game folder; FUN_0040f4f0 opens **every display mode of every DirectDraw device × D3D device** (FUN_00410550/FUN_00410700 = mode switch, FUN_00411000), logs caps and texture formats, closes it again, then returns and the game starts normally. On Windows with two monitors both screens flashed black for 30+ s (tester, 2026-11); invisible under Wine | option `diagnostics`, label "Troubleshooting: write display diagnostics", off by default, warning in its description (tested: ELIASPC.dispdiag, 60 KB) |
 | `c:\kingdom_dbg.txt` | dead: FUN_0040d2c0 (called from FUN_0043c220) only creates the file with "Logfile %s started now/today (write this code!)"; the 43 debug prints (FUN_00414600) go to OutputDebugStringA (0x6DC3E8), never to the file | no |
 | FrameAdvanceDelay (FUN_0043cb40) | slide show `In\001.bmp…` + `In\In.wav` at start, `Out\…` at exit, delay from registry `FrameAdvanceDelay` (default 1.0 s); folders are empty | no (data, not a cheat) |
 | F4 in game | requests state 0x0C (world map) – the normal "back to map" | no |
@@ -0,0 +1,113 @@
+# Llama Coaster (`coaster`, LEVELS)
+
+Package `mods/coaster`: `CoasterMod` (options, chapter check, writes `wads/T1L9M0nn.wad` +
+loading picture `T19nn.COR`), `CoasterLevel` (level script: track geometry + objects),
+`CoasterTrack` (layouts → segments, corners, waypoint chain), `CoasterSpeed` (patches the
+RollerCoaster strat's speed constants), `CoasterSim` (frame model of the strat's speed/jump logic,
+used by the tests to check a layout). Tests: `CoasterTest`. Registered in `ModRegistry` (one line).
+Docs: [docs/strats/roller-coaster.md](../docs/strats/roller-coaster.md), manual chapter 18.
+
+| Option | Default | Meaning |
+|---|---|---|
+| `track` | `loop` | `loop` (~103 units/lap) or `grand` (~150 units, two jumps, two spin pads) |
+| `laps` | 2 (1–3) | laps before the ride ends at the station |
+| `speed` | `normal` | `slow` ×0.8, `normal` ×1, `fast` ×1.25 (cruise 614 raw and boost 20 raw/frame) |
+| `coins` | on | CoinRollerCoaster along the straights (loop 27, grand 44; placed once, not per lap) |
+| `chapter` | 48 (32–49) | TestLevel chapter; a chapter another mod already wrote → apply error |
+
+## How the original rides work
+
+**Roller coaster = Catacombs 1, 3, 5 (`t1l7m001/3/5`, world 7 – not world 8; Yzma's lab is
+world 8 and has no ride).** Strat units of t1l7m001: `RollerCoaster` (unit 0, 1775 words),
+`CameraFixedPointBox`, `RollerDoor`, `CoinRollerCoaster`, `WompyRollerCoaster`,
+`FireworksTrigger`, `Camera`, `SpawnableRing`, `Sparkles`, `SpawnableNeedleBall`.
+
+* **The cart is the player.** There is no `Llama` strat: `RollerCoaster` calls `isPlayer()` and
+  `lookAtMe()`, uses `model:0` (cart with Kuzco-llama and Pacha, scale 2) and its animations
+  (lean, cheer, look back, fall). The llama is part of the cart model, not attached at runtime.
+* **Camera:** the strat spawns the shared `Camera` strat (`spawn<4,41,2,0x248000,0>(0.9, 1.0, …,
+  unit:Camera)`), the same chase camera as the Llama's; it follows `g29` = the cart's heading,
+  which the strat sets to the next waypoint's heading in corners (so the camera swings round
+  before the cart). `CameraFixedPointBox` (one per level) is a fixed-point camera zone.
+* **Track following = waypoint chain + floor.** At start (`L_0200`) every waypoint x/z is rounded
+  to halves and its heading to a quarter turn (param2). The cart drives straight along its heading
+  at speed `v19` (min 0.15 = 614 raw), the floor height comes from the collision floor below it
+  (`noFloorPhysics`, `self.y = floorHeight`; a climb steeper than ~0.1 per frame loses the
+  floor). Within 0.75 in front of the current waypoint it turns by 90° on a small arc round the
+  waypoint (funnel: lateral offset clamped to 1.2·distance) and switches to the next one – so the
+  tracks are straight legs on the grid with 90° corners; only the geometry makes slopes.
+  Left/right input shifts the cart sideways (`v18`, ±half the speed); the rails are collision walls.
+* **Floor materials** (collision material of the track bed): 5 boost (+20 raw speed and
+  "excess" per frame, decays back to cruise), 11 jump (vertical speed 163 raw, gravity 14 raw per
+  frame), 13 spin (small hop + half turn: the cart rides backwards until the next corner), 15 an
+  animation/sound pad, 16 the end (only when the current waypoint is the last one), 30 the
+  invisible death plane far below (fall → restart).
+* **Start:** the first two waypoints have param 1.0 (station): the cart crawls (0.025 + nudges)
+  out of the station with letterbox borders and the start line, then picks up cruise speed.
+* **End:** on material 16 with the last waypoint active the strat plays a sound and after 30
+  frames calls `endLevel(param1..3)` – the cart's own params 1–3 are the target (tribe, world,
+  chapter) → tally screen. `RollerDoor` are gates the cart passes, `FireworksTrigger` fires rockets
+  at its waypoint spots when the cart passes, `WompyRollerCoaster` is a spinning Wompy pick-up.
+
+**River = Jungle river 1–4 (`t1l3m001…4`, world 3; world 2 is the jungle at night).** The player
+strat is `KuscoAndPachaTogetherOnATree` (both on a log, also `isPlayer()` + the shared `Camera`).
+It also rounds its waypoints to halves/quarter turns and turns at waypoints whose param is 1 or 2
+(left/right), but it floats on water (`floorMaterial 5` = water there: rumble, splash particles)
+and is pushed by current/force zones (`RiverCurrentBox`, many "kraft" zones); the player steers
+freely between the banks, `CameraLift`/`RiverWaterfallCamera` give the scripted shots, and the
+level ends at a normal `LevelDoor`. It is a steerable boat, not a rail ride, so the coaster mod
+uses the RollerCoaster strat.
+
+## Design
+
+* **Base level = t1l7m001** (not the village + import): its STPC already has every unit the ride
+  needs and their textures, sounds and the ride music; importing `RollerCoaster` + `Camera` into
+  the village would only duplicate them. The original geometry and objects are replaced by
+  `LevelBuilder` output (`LevelScript.buildWad`), so `format.stpcmerge` is only used read-only
+  (`StpcImage`/`StratCode`) by `CoasterSpeed`.
+* **Track:** straight legs along the axes, 2 wide (two 1-wide lanes, centre line on integers),
+  joined by flat 2 × 2 corner squares; heights change only on straights. Pieces: TRACK, BOOST (mat
+  5), JUMP (11), SPIN (13), END (16), STATION, GAP (no floor). Rails 0.35 high (inner face =
+  collision), underside, pillars every 5 units and under corners, a boarding platform with posts
+  left of the station, ground plane at y = 0 with material 30. Textures are t1l7m001 TEXT indices.
+* **Leg 0** of every layout: run-in, END pad, brake run, STATION (5), first drop with a boost at
+  its top. The circuit must close (checked) and END must come before STATION on leg 0.
+* **Waypoint chain** (`CoasterTrack.nodes`): node 0 one unit behind the cart and node 1 at the
+  station's end, both param 1.0 (crawl); then one node per corner, 0.5 before its centre, heading
+  after the turn, repeated per lap; last node 9 units past the END pad on leg 0, so the END pad is
+  live only in the last lap. RollerCoaster params = (0, 1, 9, chapter) ×4096 → the tally restarts
+  the ride, like the arena.
+* **Speed** (`CoasterSpeed`): finds the six `pushShort 614` (cruise floor/cap) and two
+  `pushShort 20` (boost, after `pushVar v19/v22`) in the RollerCoaster unit with `StratListing`
+  and rewrites the 16-bit operands; nothing else changes.
+* **Checking a layout offline** (`CoasterSim`, test `everyJumpLandsAndNoClimbLosesTheFloor`):
+  for every track × speed × laps every jump must clear its gap and land before the commit zone of
+  the next corner, no climb > 0.1 per frame, speed stays 0.02–0.45.
+* Objects: `RollerCoaster` at the station start, a `RollerDoor` at the station exit, a
+  `FireworksTrigger` before the END pad with six rocket spots, CoinRollerCoaster every 1.5 units
+  on straights ≥ 4 long outside leg 0 (on a slight zig-zag). The tally total (LNFO) is the coin count.
+* Loading/tally picture: drawn in Java (dark purple, a rail curve, title "Llama Coaster" in the
+  band y 265–335 that the game's tally text leaves free).
+
+## Verified in game (apptest, :26, 2026-11-07)
+
+* loop/normal 1 lap and 2 laps, loop/fast 1 lap, grand/fast 1 lap (chapter 40), grand/slow:
+  station crawl with letterbox and start line, drops, climbs, boost arrows, start hint "Kusco, bleib in der
+  Mitte der Kurve und wir werden uns automatisch umdrehen!", spin pad (cart turns backwards), jump over the gap and
+  landing, corners, coins counted (e.g. 14/27, 19/44), END pad → fireworks → tally with the
+  loading picture. No crash in any run.
+* After the tally: **Enter** restarts the ride (same chapter); **Esc** asks "Möchtest du das
+  Spiel beenden?" (No → back to the tally). In the ride, Esc → *Beenden und zur Auswahlkarte
+  wechseln* → Yes → world-9 map on "TestLevel Kapitel 48". Same behaviour as the arena.
+
+![ride](img/mods/coaster_ride.jpg)
+![tracks (editor top view: loop, grand)](img/mods/coaster_tracks.jpg)
+![tally](img/mods/coaster_tally.jpg)
+
+## Limits
+
+* Only 90° corners on the grid and straight slopes (the strat cannot follow curves or banking);
+  no loops/inversions (the cart has no roll).
+* The tally coin count is not kept on the world map (it showed 0 after the ride) – same as the
+  other TestLevel mods; not investigated.
+* The original levels' sky/fog/lighting of t1l7m001 stays (dark catacombs, fog end 23 cells).
@@ -35,6 +35,16 @@ properties). Language/syntax: `notes/strat-language.md`. Disassembler/assembler:
  getter FUN_00550e60 and setter FUN_005509f0 share the numbering; ids without a setter are read-only
  (a write would go to address 0).

+## Spawning and collision (engine facts, found by the arena, 2026-11-07)
+
+* `spawn<params, vars, slots, typeFlags, extra>` (0xe0, FUN_0054bfc0) takes the same fields as a MAP
+  strat record: params = MAP parameter count, vars = local variables, slots, typeFlags = MAP type flags
+  (collision setup), `extra` = words of the collision-bone area.
+* `spawn` copies the spawner's matrix/translation block (+0x20…), not its `x/y/z` properties: after
+  `self.x = …` the child still appears at the old place. Set the position, **yield**, then spawn.
+* A MAP-placed type that uses `collisionOn` needs collision type flags in its MAP record (0x28000 like
+  Coin); with typeFlags 0 the game crashes (page fault in the heap allocator FUN_0041ae20).
+
 ## Sources

 * groove.exe handler tables, decompiled with Ghidra 12.2 (headless, all 0x1b2 + 0x45 entries and
@@ -642,7 +652,7 @@ ops = operands (inline words for long ops, the 16-bit argument for short ops); p
 | 143 | `camScale` | yes | yes | low | DAT_006D9D30, camera value initialised to 1.0 (zoom/fov factor?). |
 | 144 | `levelHeaderC` | yes | no | low | Level header (DAT_00584648)+0x0C ushort << 12. |
 | 145 | `slopeSteepness` | yes | no | medium | 1.0 - floor normal y (DAT_0057DDA4) << 12: 0 on flat ground (FUN_004054c0). |
-| 147 | `levelTableByte` | yes | no | low | Byte table 0x585024[map + (chapter + tribe*10)*4] << 12 (per-level constant). |
+| 147 | `levelTableByte` | yes | no | low | Byte table 0x585024[map + (world + tribe*10)*4] << 12 (FUN_0041af40(tribe, world, map)); bss, never written by the game (always 0) – but world-9 coin counters of TestLevel chapters 22–31 land in its tribe-1 part (see testlevel-chapters.md). |
 | 149 | `flagEC_1` | yes | no | low | Flag +0xEC & 0x1. |
 | 150 | `flagEC_8000000` | yes | no | low | Flag +0xEC & 0x8000000. |
 | 151 | `cheat5` | yes | no | medium | Cheat toggle bits DAT_00584710 & 0x20 (button-sequence cheats, FUN_0041a0xx). |
@@ -660,10 +670,10 @@ ops = operands (inline words for long ops, the 16-bit argument for short ops); p
 | 165 | `instanceData1` | yes | yes | low | Map-instance record (+0xF0)+0x28 -> word 1. |
 | 166 | `floorCollisionOn` | yes | no | medium | Flag +0xEC & 0x8000 (floor collision, ops 0xa5/0xa6). |
 | 169 | `lives` | yes | yes | low | DAT_00584E6C (fixed, starts at 5.0, saved per slot) - lives or max health. |
-| 171 | `saveProgressA` | yes | no | low | DAT_00585008 << 12 (saved progress byte). |
-| 172 | `progressWorld` | yes | no | low | DAT_0058500C << 12 (saved; world of the furthest/selected level, 8 = finale). |
-| 173 | `progressChapter` | yes | no | low | DAT_00585010 << 12 (saved; chapter, 6 with world 8 = last level). |
-| 174 | `saveProgressB` | yes | no | low | DAT_00585014 << 12 (saved progress byte). |
+| 171 | `saveProgressA` | yes | no | low | DAT_00585008 << 12: last played tribe (KSV +0x3E, set by endLevel). |
+| 172 | `progressWorld` | yes | no | low | DAT_0058500C << 12: last played world (KSV +0x3F, set by endLevel; 8 = finale). |
+| 173 | `progressChapter` | yes | no | low | DAT_00585010 << 12: last played chapter (KSV +0x40; 6 with world 8 = last level). |
+| 174 | `saveProgressB` | yes | no | low | DAT_00585014 << 12: last played map (KSV +0x41). |
 | 175 | `unk_6da308` | yes | no | low | DAT_006DA308, no other reference. |
 | 178 | `cheat4` | yes | no | medium | DAT_00584710 & 0x10 (cheat toggle). |
 | 179 | `hudFlags` | yes | yes | medium | DAT_006DA2E0 HUD element enable mask (default 0x3F000; 0x2000 timer, 0x8000/0x10000/0x20000/0x40000 counters). |
@@ -676,7 +686,7 @@ ops = operands (inline words for long ops, the 16-bit argument for short ops); p
 | 187 | `hitDamage` | yes | yes | medium | +0x140: damage dealt on contact (copied into the other strat's +0x144). |
 | 188 | `damageTaken` | yes | no | medium | +0x144: damage received from the last contact (player cleared to 0 each frame). |
 | 189 | `health2` | yes | yes | medium | DAT_00584E70 = health (same as 92, settable). |
-| 190 | `levelRecord` | yes | yes | low | Per-level saved word DAT_00584F1C[chapter + world*6] (best/collected value for the current level; HUD shows it). |
+| 190 | `levelRecord` | yes | yes | medium | Coin counter of the current level: u32 DAT_00584F1C[chapter + world*6] (coins << 12; HUD and tally show it, zeroed on level start, KSV keeps worlds 0–8 as u16). World 9 has no row: TestLevel chapter c hits 0x584FF4 + 4c (chapter 9 = furthest progress 0x585018) – only chapters 1 and 32–49 are free (testlevel-chapters.md). |
 | 191 | `counterC` | yes | yes | low | DAT_00584FFC: persistent HUD counter (icon 0x150), saved. |
 | 192 | `counterA` | yes | yes | low | DAT_00584FF4: persistent HUD counter (icon 0x184, displayed up to 999) - probably coins. |
 | 201 | `distToPlayerSq` | yes | no | high | +0x148: cached squared distance to the player ((d>>6)^2 sum), updated each frame when tracking (op 0x30). |
@@ -57,7 +57,8 @@ WAD path absolute!), `rs.sh NAME "SEQ"` (restart with installed WAD + `seq`, mon
 **Caution**: no `pgrep -f groove.exe` in wait loops – it matches your own shell
 (the command line contains "groove.exe") and lamatest takes it for a foreign instance.

-State/PIDs/wine.log: `$LAMATEST_DIR` (default `/tmp/lamatest-$USER`).
+State/PIDs/wine.log: `$LAMATEST_DIR` (default `/tmp/lamatest-$USER`). Game: `$LAMA_WINEPREFIX` (default `~/.wine-lama`),
+`lama-mod`: `$LAMA_MOD` (see [docs/tools.md](../docs/tools.md#paths)).

 `run` exit codes: 0 OK, 3 crash, 4 timeout/hang, 5 image frozen.
 Output in `<outdir>`: `report.txt`, `wine.log` (stderr, truncated to 2 MB),
@@ -66,7 +67,7 @@ Output in `<outdir>`: `report.txt`, `wine.log` (stderr, truncated to 2 MB),

 ## Safety rules (implemented in the script)

- Aborts if a groove.exe with a different DISPLAY is running (Elias' instance).
+- Aborts if a groove.exe with a different DISPLAY is running (the user's own instance).
 - xdotool only with DISPLAY=:5.
 - Sound: own null sink, the app is never muted; `stop` unloads the sink.
 - Save games (`*.ksv` in the game folder) are backed up on `start` and restored
@@ -0,0 +1,149 @@
+# TestLevel chapters: which ones are safe (2026-11-07)
+
+World 9 ("TestLevel") has 49 chapter slots (table 0x572420), but the game's per-chapter arrays only
+have rows for worlds 0–8. Indexing them with world 9 runs into other globals. Code:
+`save/TestLevelChapters` (usable = chapter **1** and **32–49**).
+
+## The arrays (index world·6 + chapter)
+
+| Array | Where it is used |
+|---|---|
+| u32 coins 0x584F1C (coins << 12) | `levelRecord` (strat var 0xBE) get/set, HUD (FUN_00426bf0), tally (FUN_0040dd60), endLevel (FUN_0054d620: "all coins" check), **zeroed on every level start** (FUN_0041cba0), KSV keeps 54 entries as u16 |
+| u8 flags 0x584EC8 (bit 0 collectible, bit 1 gold coin) | collectible picked up (HUD, strat var 0xFA rising) → \|=1; endLevel → \|=2 when coins == static total 0x5722F4[world·5 + chapter] (garbage for world 9, often 0) or cheat 0x584710&8 → \|=3; gold count FUN_0041cd70 (worlds 1–8 only) |
+
+Coin total table 0x5722F4 and the selection map only know worlds 1–8 (map shows garbage targets
+for world 9 – cosmetic).
+
+## What world-9 chapter c hits
+
+Coin slot 0x584FF4 + 4c, flag byte 0x584EFE + c (Ghidra references 0x584EF0–0x585240):
+
+| c | coin slot | flag byte |
+|---|---|---|
+| 0 | 0x584FF4 counter var 0xC0 (HUD) | free |
+| **1** | 0x584FF8 free (only cleared by new game) | free |
+| 2 | 0x584FFC counter var 0xBF (HUD icon 0x150) | free |
+| 3 | 0x585000 HUD flag (FUN_00427c40) | free |
+| 4 | 0x585004 var 0x80 | free |
+| 5–8 | 0x585008–14 last played tribe/world/chapter/map (strat vars 0xAB–0xAE, KSV +0x3E–41) | free |
+| 6–9 | | 0x584F04 **language index** (u32; \|=2 → text table out of range) |
+| 9 | 0x585018 **furthest progress** (world, chapter bytes; KSV +0x42/43) | |
+| 10–13 | 0x58501C/20 free | 0x584F08 option (KSV +0xD6) |
+| 12 | 0x585024 start of byte table (var 0x93, tribe 0) | |
+| 14–21 | 0x585028–48 free | 0x584F0C / 0x584F10 (var 0x5B) |
+| 22–25 | 0x58504C–58 table 0x585024, tribe 1 (read by var 0x93 in original levels) | free |
+| 26–29 | table, tribe 1 | 0x584F18 option (KSV +0xD8) |
+| 30–31 | table, tribe 1 (world 8/9) | coin slots of world 0 (never read) |
+| **32–49** | table, tribes 2/3 (never used: tribe is 1, 4 only in the attract demo) | coin slots of world 0 |
+
+## Verified in game (apptest :24, 2026-11-07)
+
+* **Chapter 9** (arena test mod, 1 alligator, 2 coins collected): pause → "Beenden und zur
+  Auswahlkarte" → the selection map shows world "°p", "Kapitel 0", coin target 14384: furthest
+  progress 0x585018 was replaced by the coin counter (2 << 12 → world 0, chapter 32).
+  ![chapter 9: broken map](img/mods/testlevel_ch9_map_broken.jpg)
+* **Chapter 49** (same run): tally "Münzen gesammelt 2 / 12, Geheimnisse 0 / 0" (LNFO recounted),
+  save written with progress (9, 50) – the map caps the cursor at chapter 49, no crash; map fine.
+  ![chapter 49 tally](img/mods/testlevel_ch49_tally.jpg)
+* Before (arena on chapter 8, arena agent): tally "0 / 55": the collected value is the coin slot
+  after endLevel copied the level ids into 0x585008–14 (chapter 8 = last played map = 0), the total
+  is LNFO of the Village base.
+
+## Tally totals (LNFO)
+
+Chunk LNFO = u32 coins, u32 secrets → 0x5FF070 / 0x5FF060 (FUN_0042AB10; the tally shows the values
+of the level just finished, kept in 0x5FF064 / 0x5FF06C). Originals: e.g. t1l3m004 40 = 20 Coin +
+4 Coin5·5; levels with CoinLine/CoinCircle/enemies count those too. `mods/levels/LevelTally` recounts
+Coin (1) + Coin5 (5) and Secret strats for new level projects and the Test World (20 coins, 0
+secrets); the arena adds its dynamic coins (alligator hit/death coins + 5 exit bonus).
+
+## Migration
+
+* Level projects: stored chapter 1 or 32–49 kept (first file wins), others get the first free of
+  32–49; more than 18 projects share chapters (only one of them can be on – apply error otherwise).
+  Play-tests/exports of an old project: `migrate` (2..19 → 32..49, 20..31 → 32..43).
+* The chapter options are choices (level: 1, 32–49; arena: 32–49, default 49); a stored old value is
+  invalid and falls back to the default (ModOptions).
+* Editor: New level / Level settings spinners only offer usable chapters. The empty template
+  (`Templates.makeEmpty`) defaults to 32; New level and CLI `--editor-new` take the first chapter
+  from 32 no project in the levels folder uses (`LevelProjects.nextFreeChapter`).
+
+![chapter option](img/mods/testlevel_chapter_option.jpg)
+
+## Fix: base exe patch relocates both arrays (ExePatcher.REVISION 2, 2026-11-07)
+
+`ExePatcher.relocateLevelRecords` (part of the always-applied base patch: `ExePatcher.patch` for
+the installer, `ExePatcher.changes` replayed as owner "base" in `ModManager.baseExe`) moves both
+arrays to a 128-entry buffer (index ≤ 9·6 + 49 = 103) in the slack after .data's VirtualSize:
+.data ends at 0x6DB935, the page at 0x6DC000 (.idata follows), so coins u32[128] at **0x6DB940**,
+flags u8[128] at **0x6DBB40** (zero-filled and RW, mapped with .data's last page; no new section,
+no code). Every absolute address of the arrays in .text is rewritten (whole-file scan of
+0x584EC8–0x584EFE / 0x584F1C–0x584FF4: no other references, none in .data):
+
+| Old | New | Sites (operand VA) |
+|---|---|---|
+| 0x584F1C coins | 0x6DB940 | tally 0x40DE67, KSV load 0x41C72A / save 0x41C8FB, new game 0x41CA6B, level start 0x41CBCC, HUD 0x426AC2 / 0x426D43 / 0x426E08, endLevel 0x54D6BA, levelRecord ptr 0x550BC5, 0x55223E |
+| 0x584FF4 coin loop end (`cmp eax, imm; jl`) | 0x6DBA18 | 0x41C74B, 0x41C91A (0x584FF4 itself is also counter var 0xC0 – those uses stay) |
+| 0x584EC8 flags | 0x6DBB40 | tally 0x40DEA1 / 0x40DEC9, KSV 0x41C65C / 0x41C832, new game 0x41CA64 (rep stosd 54 bytes), collectible 0x42706B, endLevel 0x54D6E3 / 0x54D708 / 0x54D70F |
+| 0x584ECE flags from world 1 | 0x6DBB46 | map icons 0x41B724 / 0x41B79C / 0x41B7EE / 0x54A75E, gold count 0x41CD7B |
+| 0x584EFE flag loop end | 0x6DBB76 | KSV 0x41C6D6 / 0x41C8AF, gold count 0x41CD9B |
+
+Worlds 0–8 behave as before (KSV keeps the first 54 entries; the rest is never saved). World-9
+flags are not cleared by "new game" (only the 54 saved bytes are) – they only affect the map's
+collectible/gold icons of TestLevel chapters within one game session. If the counts of these
+references differ (other exe build) the relocation is skipped as a whole. Test: `ExePatcherTest`.
+
+**Effect:** every world-9 chapter is harmless in LlamaMod's groove.exe, so the remaining holes are
+closed without restricting the map: picking an empty (linked) chapter like 9 on the world map,
+chapters 2–31 that unlock together with 32+, and Boot to level on chapters 2–31 (its option keeps
+1–49). Not linking empty chapters is no option: a missing WAD crashes the map ("Couldnt load wad",
+`ModManager.world9Fixup`). Mod levels still only use 1 and 32–49 (no migration churn; also safe
+with an exe that has not been rebuilt yet after the update).
+
+Verified in game (apptest :24, 2026-11-07):
+
+* A/B, Test World on, map cursor world 9 chapter 9 (the linked empty chapter), start, pause →
+  quit to the map: old jar (base REVISION 1) → map "°p / Kapitel 0 / 14384" (progress zeroed by the
+  level start alone); new → "TestLevel / Kapitel 9 / 237" (237 = garbage static coin total, cosmetic).
+  ![chapter 9 before/after](img/mods/testlevel_ch9_fixed.jpg)
+* Arena (test mod) on chapter 9, 2 coins collected (HUD 2 / 12), quit to the map → map fine.
+* Save with world-1 chapter 1 flags = 3 and gold count 2: slot menu "Goldmünzen 2", the map shows
+  the collectible and gold icons of Village chapter 1 (KSV load loop + map reads relocated).
+* **KSV save loop after finishing a normal level, A/B byte comparison** (apptest :25, sessions
+  `savetest-a` = fat jar of the commit before 00b2880, base REVISION 1; `savetest-b` = HEAD,
+  REVISION 2; 2026-11-07). Slot 3 (`king2.ksv`) preloaded identically in both with a distinct
+  pattern for worlds 1–8, chapters 1–5: flags `(w + c) % 4`, coins `((5w + c) % 15 + 1) << 12`
+  (gold count 19/20 to match), so a save loop reading the old arrays in B would write zeros.
+  Mods: boot-to-level (slot 3) + cheats `rewards` (flags |= 3 at the chapter end). Runs:
+  1. **Jungle night 2** (world 2 ch. 2, exit pad reachable directly): start `29.45, 3.5, 60.3, 180
+     @ 2/2`, Up ~5.5 s → 3 coins → tally "Münzen gesammelt 3 / 70" → Return.
+  2. **Village 1** (world 1 ch. 1): t1l1m001 rebuilt by a throw-away tool (WadImporter → tile 420
+     set to its swap-alt model 49 with the exit pad, RubyIdolDoor removed, the two coins near the
+     door moved to x 42.5, `StartOverride` 42.5/3.5/51.8 yaw 180 → WadBuilder), written over the
+     session's `cd-active/wads/t1l1m001.wad` after apply; Up 3.5 s → tally "Dorf Kapitel 1,
+     Münzen gesammelt 2 / 55" → Return. (Village 4's direct exit is behind the Yzma boss fight.)
+  3. **TestLevel chapter 1** (Test World, start `44.3, 3.6, 15.5, 90 @ 9/1`, 3 coins, rewards
+     cheat) on top of the Village-1 save → tally → Return.
+
+  All three saved KSVs are **byte-identical in A and B** (`cmp`: 0 differences). Run 1: chapter
+  (2,2) coins 9 → 3, flags 0 → 3, gold 20 → 21, progress (2,2) → (2,3), cursor (2,3), last played
+  (2,2); every other preloaded coin/flag entry and bytes 0xB0–0xFF unchanged. Run 2: (1,1) coins
+  → 2, flags → 3, gold 19 → 20, progress (1,2). Run 3 (world-9 leak check): only cursor world/chapter
+  (9,1) and last-played world 9 change; all 54 coin/flag entries, gold, progress and 0xB0–0xFF stay
+  as before – the world-9 coins/flags (buffer index 55) are not written (54 entries only). B's save
+  loaded again without mods: slot menu "Gespeichertes Spiel 3 / Dorf Kapitel 2 / Goldmünzen 20",
+  world map on Village 2 with the collectible and gold icons (preloaded flags 3).
+  ![tallies, slot menu, map (B)](img/mods/testlevel_save_ab.jpg)
+* **TestLevel tally** (question from the coaster test): Return does save (KSV rewritten, see run 3)
+  – there is never a visible "saved" step, also not in normal levels (the next level loads at
+  once). The Test World / coaster / arena exits lead back to the same chapter, so the restart zeroes
+  that chapter's coin counter (level start, FUN_0041cba0) → the map then shows 0; world-9 coins are
+  never in the KSV anyway. Expected and harmless. Esc on the tally asks "Möchtest du das Spiel
+  beenden? Ja / Nein" (Return = Nein, back to the tally) – identical with the old exe (A), so not
+  caused by the relocation. ![Esc on the tally](img/mods/testlevel_tally_esc.jpg)
+
+## Before the fix
+
+* The map let the player pick any unlocked world-9 chapter; empty ones are linked to an installed
+  world-9 WAD (ModManager), so playing e.g. chapter 9 from the map still clobbered progress. Unlocking
+  chapter 32+ unlocks 2–31 on the map too. Fixed by the relocation above.
@@ -6,6 +6,7 @@ import com.eliasmueller.llamamod.editor.model.Light;
 import com.eliasmueller.llamamod.editor.model.NodeKind;
 import com.eliasmueller.llamamod.editor.model.PathNode;
 import com.eliasmueller.llamamod.editor.model.Scene;
+import com.eliasmueller.llamamod.save.TestLevelChapters;
 import java.io.IOException;
 import java.util.List;
 import java.util.Locale;
@@ -45,7 +46,7 @@ public final class Templates {
        LevelSettings st = s.settings();
        st.setRaw("kind", LevelSettings.NEW);
        st.setRaw("name", "New level");
-        st.setRaw("targetChapter", 1);
+        st.setRaw("targetChapter", TestLevelChapters.FIRST);
        st.setRaw("poolReserve", NEW_LEVEL_RESERVE);
        int[] table = s.regions().table().clone();
        table[0] = 0xffffffff;
@@ -26,7 +26,7 @@ import com.eliasmueller.llamamod.format.TextChunk;
 import com.eliasmueller.llamamod.format.Trak;
 import com.eliasmueller.llamamod.format.Vertex;
 import com.eliasmueller.llamamod.format.Wad;
-import com.eliasmueller.llamamod.levelbuild.LevelBuilder;
+import com.eliasmueller.llamamod.levelbuild.BaseTextures;
 import java.io.ByteArrayOutputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
@@ -340,7 +340,7 @@ public final class WadImporter {
            s.addQuiet(pg);
        }
        List<TextChunk.TextureEntry> te = TextChunk.textureEntries(d);
-        Map<Integer, String> names = textureNames(s.settings().base());
+        Map<Integer, String> names = textureNames(d);
        for (int i = 0; i < te.size(); i++) {
            TextureEntry t = textureEntry("tex:" + i, te.get(i));
            t.setRaw("name", names.getOrDefault(i, ""));
@@ -383,11 +383,13 @@ public final class WadImporter {
        return t;
    }

-    /** Names of village textures (levelbuild names) for the outliner; other levels have none. */
-    private static Map<Integer, String> textureNames(String base) {
+    /** Village texture names (levelbuild names) for the outliner, wherever the level has the picture. */
+    private static Map<Integer, String> textureNames(byte[] text) {
        Map<Integer, String> m = new HashMap<>();
-        if ("t1l1m001".equalsIgnoreCase(base)) {
-            LevelBuilder.TEX.forEach((k, v) -> m.putIfAbsent(v, k));
+        try {
+            BaseTextures.resolve(text).forEach((k, v) -> m.putIfAbsent(v, k));
+        } catch (RuntimeException e) {
+            // unusual TEXT layout: no names
        }
        return m;
    }
@@ -57,7 +57,9 @@ public final class ViewerDemo {
                o.put(a, args[++i]);
            }
        }
-        Path cd = Path.of(o.getOrDefault("--cd", System.getProperty("user.home") + "/.wine-lama/iso-dk/Setup/Eng/Cd"));
+        String envCd = System.getenv("LLAMAMOD_CD");
+        Path cd = Path.of(o.getOrDefault(
+                "--cd", envCd != null ? envCd : System.getProperty("user.home") + "/.wine-lama/iso-dk/Setup/Eng/Cd"));
        byte[] wad;
        if (args[0].equals("testworld")) {
            byte[] base = Files.readAllBytes(cd.resolve(LevelBuilder.BASE_WAD));
@@ -7,6 +7,8 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Cursor;
 import java.awt.Graphics;
+import java.awt.KeyEventDispatcher;
+import java.awt.KeyboardFocusManager;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
 import java.awt.event.InputEvent;
@@ -93,6 +95,38 @@ public final class Viewport extends JPanel {
    private boolean dirty = true;
    private long lastTick = System.nanoTime();
    private final Set<Integer> keys = new HashSet<>();
+
+    /**
+     * While flying, WASD/QE/Shift reach the fly loop even if another component (a text field, a
+     * dock) still has the keyboard focus: with some window managers the heavyweight GL canvas does
+     * not get the focus from a right-click.
+     */
+    private final KeyEventDispatcher flyKeys = e -> {
+        if (!this.flying) {
+            return false;
+        }
+        if (e.getID() == KeyEvent.KEY_PRESSED) {
+            keys.add(e.getKeyCode());
+        } else if (e.getID() == KeyEvent.KEY_RELEASED) {
+            keys.remove(e.getKeyCode());
+        }
+        // modifiers pass on (others track Shift, e.g. the play-here crosshair); typed keys do not
+        int k = e.getKeyCode();
+        return k != KeyEvent.VK_SHIFT && k != KeyEvent.VK_CONTROL && k != KeyEvent.VK_ALT && k != KeyEvent.VK_META;
+    };
+
+    @Override
+    public void addNotify() {
+        super.addNotify();
+        KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(flyKeys);
+    }
+
+    @Override
+    public void removeNotify() {
+        KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventDispatcher(flyKeys);
+        super.removeNotify();
+    }
+
    private boolean flying;
    private BufferedImage capture;
    private boolean captureNext;
@@ -1131,6 +1165,7 @@ public final class Viewport extends JPanel {
            }
            if (drag == Drag.FLY) {
                flying = false;
+                keys.clear(); // a key released after the button may have gone to another component
                canvas.setCursor(Cursor.getDefaultCursor());
            }
            if (drag != Drag.NONE && buttonOf(drag, e)) {
@@ -191,8 +191,14 @@ public final class EnvMath {
        "ENDGAME"
    };

+    /** Ids whose {@code .ASF} file the (German) CD does not have: GAMEOVER, TALLY, PUZZLE2, PLATFORM. */
+    private static final List<Integer> NO_FILE = List.of(10, 11, 36, 37);
+
    public static String musicLabel(int id) {
-        return id >= 0 && id < MUSIC.length ? id + " – " + MUSIC[id] : id + " – (unknown)";
+        if (id < 0 || id >= MUSIC.length) {
+            return id + " – (unknown)";
+        }
+        return id + " – " + MUSIC[id] + (NO_FILE.contains(id) ? " (no file on the CD)" : "");
    }

    // ------------------------------------------------------------ lights
@@ -17,6 +17,7 @@ import com.eliasmueller.llamamod.editor.model.cmd.Command;
 import com.eliasmueller.llamamod.editor.model.cmd.SetProp;
 import com.eliasmueller.llamamod.editor.ui.EditorContext;
 import com.eliasmueller.llamamod.mods.levels.LevelProjects;
+import com.eliasmueller.llamamod.save.TestLevelChapters;
 import java.awt.BorderLayout;
 import java.awt.Dimension;
 import java.awt.GridLayout;
@@ -38,6 +39,7 @@ import javax.swing.JScrollPane;
 import javax.swing.JSpinner;
 import javax.swing.JTextArea;
 import javax.swing.JTextField;
+import javax.swing.SpinnerListModel;

 /** Level → Settings: name, chapter, grid size, death plane, WFPC flags, object pool (one undo step). */
 final class LevelSettingsDialog {
@@ -80,9 +82,13 @@ final class LevelSettingsDialog {
                "Base level",
                new JLabel(st.base() + "  (object code, textures, sounds)"),
                "Fixed when the project is created (the project stores only the differences to it)");
-        JSpinner chapter = Ui.number(Math.max(1, st.targetChapter()), 1, 49, 1, "0", v -> {});
+        JSpinner chapter = new JSpinner(new SpinnerListModel(TestLevelChapters.all()));
+        chapter.setValue(TestLevelChapters.migrate(st.targetChapter()));
        JLabel used = new JLabel(usedChapters(ctx, st.targetChapter()));
-        f.row("TestLevel chapter", chapter, "New levels replace this chapter of world 9 (TestLevel)");
+        f.row(
+                "TestLevel chapter",
+                chapter,
+                "New levels replace this chapter of world 9 (TestLevel): 32–49, or 1 (the Test World's)");
        f.full(used);
        chapter.setEnabled(st.isNewLevel());

@@ -19,8 +19,8 @@ final class GeoIcons {
    private static final Color RED = new Color(0xD93F3F);

    static void register() {
-        Icons.register("prim-box", (g, fg) -> block(g, 2, 5, 12, 8, TOP, SIDE));
-        Icons.register("prim-platform", (g, fg) -> block(g, 1, 4, 14, 4, TOP, SIDE));
+        Icons.register("prim-box", (g, fg) -> block(g, 2, 1, 12, 8, TOP, SIDE));
+        Icons.register("prim-platform", (g, fg) -> block(g, 1, 2.5, 14, 4, TOP, SIDE));
        Icons.register("prim-floor", (g, fg) -> {
            Path2D p = poly(1, 10, 8, 6.5, 15, 10, 8, 13.5);
            g.setColor(TOP);
@@ -47,7 +47,7 @@ final class GeoIcons {
            g.setColor(fg);
            g.draw(p);
        });
-        Icons.register("prim-pillar", (g, fg) -> block(g, 5, 2, 6, 12, STONE, STONE.darker()));
+        Icons.register("prim-pillar", (g, fg) -> block(g, 5, 0.5, 6, 12, STONE, STONE.darker()));
        Icons.register("prim-cylinder", (g, fg) -> {
            g.setColor(STONE.darker());
            g.fill(new java.awt.geom.Rectangle2D.Double(2, 6, 12, 5));
@@ -122,7 +122,7 @@ final class GeoIcons {
        Icons.register("prim-invbox", (g, fg) -> {
            g.setStroke(
                    new BasicStroke(1.2f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 1, new float[] {2, 1.5f}, 0));
-            outlineBlock(g, 2, 5, 12, 8, new Color(255, 60, 60, 60), RED);
+            outlineBlock(g, 2, 1, 12, 8, new Color(255, 60, 60, 60), RED);
        });
        Icons.register("geo-collision", (g, fg) -> {
            Path2D p = poly(1, 10, 8, 6.5, 15, 10, 8, 13.5);
@@ -221,6 +221,7 @@ final class GeoIcons {
    }

    /** Isometric block: x, y of the top-left, width w, side height h. */
+    /** An isometric block filling y .. y + w / 2 + h; keep that within the 16 × 16 icon box. */
    private static void block(Graphics2D g, double x, double y, double w, double h, Color top, Color side) {
        Color fg = g.getColor();
        double d = w / 4;
@@ -1,11 +1,15 @@
 package com.eliasmueller.llamamod.editor.tools.geometry;

+import com.eliasmueller.llamamod.editor.model.NodeKind;
 import com.eliasmueller.llamamod.editor.model.Scene;
+import com.eliasmueller.llamamod.editor.model.SceneEvent;
 import com.eliasmueller.llamamod.editor.model.TextureEntry;
 import com.eliasmueller.llamamod.editor.model.TexturePage;
 import com.eliasmueller.llamamod.editor.render.Legend;
 import com.eliasmueller.llamamod.editor.ui.EditorContext;
 import com.eliasmueller.llamamod.editor.ui.Widgets;
+import com.eliasmueller.llamamod.format.TextChunk;
+import com.eliasmueller.llamamod.levelbuild.BaseTextures;
 import com.eliasmueller.llamamod.levelbuild.LevelBuilder;
 import com.eliasmueller.llamamod.util.SwingListeners;
 import java.awt.BorderLayout;
@@ -19,11 +23,12 @@ import java.awt.Image;
 import java.awt.RenderingHints;
 import java.awt.image.BufferedImage;
 import java.util.ArrayList;
-import java.util.IdentityHashMap;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Set;
 import java.util.WeakHashMap;
 import java.util.function.Consumer;
 import java.util.function.IntConsumer;
@@ -145,12 +150,49 @@ final class GeoWidgets {

    private static final Map<Scene, Map<String, BufferedImage>> CACHE = new WeakHashMap<>();

+    private static final Map<Scene, Map<String, Integer>> NAMES = new WeakHashMap<>();
+
+    /** Scenes whose texture/page edits clear their cache entries (listener added on first use). */
+    private static final Set<Scene> WATCHED = Collections.newSetFromMap(new WeakHashMap<>());
+
    static void clearCache(Scene s) {
        CACHE.remove(s);
+        NAMES.remove(s);
+    }
+
+    private static void watch(Scene s) {
+        if (WATCHED.add(s)) {
+            s.addListener(e -> {
+                if (e.type() == SceneEvent.Type.RELOADED
+                        || e.node().kind() == NodeKind.TEXTURE
+                        || e.node().kind() == NodeKind.TEXTURE_PAGE) {
+                    clearCache(s);
+                }
+            });
+        }
+    }
+
+    /** Village texture names the scene's textures show (name → index), see {@link BaseTextures}. */
+    static Map<String, Integer> names(Scene s) {
+        if (s == null) {
+            return LevelBuilder.TEX;
+        }
+        watch(s);
+        return NAMES.computeIfAbsent(s, k -> {
+            List<TextChunk.TextureEntry> e = new ArrayList<>();
+            for (TextureEntry t : k.textures()) {
+                e.add(t.toFormat());
+            }
+            List<TextChunk.Page> p = new ArrayList<>();
+            for (TexturePage pg : k.pages()) {
+                p.add(new TextChunk.Page(pg.flags(), pg.width(), pg.height(), pg.pixels()));
+            }
+            return BaseTextures.resolve(e, p);
+        });
    }

    /** Texture index of a brush texture name (names, "#n", flats → -1), or -1. */
-    static int index(String tex) {
+    static int index(Scene s, String tex) {
        if (tex == null || tex.isEmpty()) {
            return -1;
        }
@@ -161,7 +203,7 @@ final class GeoWidgets {
                return -1;
            }
        }
-        Integer i = LevelBuilder.TEX.get(tex);
+        Integer i = names(s).get(tex);
        return i == null ? -1 : i;
    }

@@ -181,13 +223,14 @@ final class GeoWidgets {
        if (s == null || tex == null || tex.isEmpty()) {
            return null;
        }
+        watch(s);
        Map<String, BufferedImage> m = CACHE.computeIfAbsent(s, k -> new LinkedHashMap<>());
        if (m.containsKey(tex)) {
            return m.get(tex);
        }
        BufferedImage img = null;
        Color flat = flatColor(tex);
-        int i = index(tex);
+        int i = index(s, tex);
        if (flat != null) {
            img = new BufferedImage(8, 8, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g = img.createGraphics();
@@ -240,17 +283,17 @@ final class GeoWidgets {
        return new ImageIcon(out);
    }

-    /** All texture choices of the scene: named village textures, flat colours, then "#n". */
+    /**
+     * All texture choices of the scene: the village texture names its base has, flat colours, then
+     * "#n".
+     */
    static List<String> choices(Scene s) {
-        List<String> l = new ArrayList<>(LevelBuilder.TEX.keySet());
+        Map<String, Integer> names = names(s);
+        List<String> l = new ArrayList<>(names.keySet());
        l.addAll(new java.util.TreeSet<>(LevelBuilder.FLAT.keySet()));
-        Map<Integer, Boolean> named = new IdentityHashMap<>();
-        for (int v : LevelBuilder.TEX.values()) {
-            named.put(v, true);
-        }
        if (s != null) {
            for (int i = 0; i < s.textures().size(); i++) {
-                if (!LevelBuilder.TEX.containsValue(i)) {
+                if (!names.containsValue(i)) {
                    l.add("#" + i);
                }
            }
@@ -337,21 +337,36 @@ public final class ManualContent {
        return switch (o.type()) {
            case BOOL -> "on / off";
            case INT -> o.min() + " – " + o.max();
-            case CHOICE -> {
-                List<String> c = new ArrayList<>();
-                o.choices().forEach(ch -> c.add(ch.label()));
-                yield String.join(", ", c);
-            }
-            case MULTI -> {
-                List<String> c = new ArrayList<>();
-                o.choices().forEach(ch -> c.add(ch.label()));
-                yield "any of " + String.join(", ", c);
-            }
+            case CHOICE -> choiceList(o);
+            case MULTI -> "any of " + choiceList(o);
            case SEED -> "any text";
            case STRING -> "text";
        };
    }

+    /** Choice labels, comma-separated; runs of three or more consecutive numbers as "a – b". */
+    static String choiceList(ModOption o) {
+        List<String> labels = o.choices().stream().map(ModOption.Choice::label).toList();
+        List<String> out = new ArrayList<>();
+        for (int i = 0; i < labels.size(); ) {
+            int j = i;
+            while (j + 1 < labels.size() && consecutive(labels.get(j), labels.get(j + 1))) {
+                j++;
+            }
+            if (j - i >= 2) {
+                out.add(labels.get(i) + " – " + labels.get(j));
+            } else {
+                out.addAll(labels.subList(i, j + 1));
+            }
+            i = j + 1;
+        }
+        return String.join(", ", out);
+    }
+
+    private static boolean consecutive(String a, String b) {
+        return a.matches("-?\\d{1,9}") && b.matches("-?\\d{1,9}") && Integer.parseInt(b) == Integer.parseInt(a) + 1;
+    }
+
    private static String defaultText(ModOption o) {
        return switch (o.type()) {
            case BOOL -> "true".equals(o.defaultValue()) ? "on" : "off";
@@ -17,6 +17,7 @@ import com.eliasmueller.llamamod.platform.Config;
 import com.eliasmueller.llamamod.platform.GameLauncher;
 import com.eliasmueller.llamamod.platform.Json;
 import com.eliasmueller.llamamod.platform.Progress;
+import com.eliasmueller.llamamod.save.TestLevelChapters;
 import com.eliasmueller.llamamod.save.Worlds;
 import java.io.IOException;
 import java.nio.file.Files;
@@ -50,7 +51,7 @@ public final class PlaytestRunner {
    /** World/chapter of a project: TestLevel chapter, or the original's place; null if not on the map. */
    public static int[] target(Document d) {
        if (d.isNewLevel()) {
-            return new int[] {9, Math.max(1, d.scene().settings().targetChapter())};
+            return new int[] {9, TestLevelChapters.migrate(d.scene().settings().targetChapter())};
        }
        Matcher m = Pattern.compile("t1l(\\d)m(\\d{3})").matcher(d.base().toLowerCase(Locale.ROOT));
        if (m.matches()) {
@@ -40,6 +40,11 @@ public final class Icons {

    private Icons() {}

+    /** Names of all registered icons (sorted). */
+    public static java.util.List<String> names() {
+        return PAINTERS.keySet().stream().sorted().toList();
+    }
+
    public static void register(String name, Painter p) {
        PAINTERS.put(name, p);
        CACHE.keySet().removeIf(k -> k.startsWith(name + "@"));
@@ -1,9 +1,8 @@
 package com.eliasmueller.llamamod.editor.ui;

-import com.eliasmueller.llamamod.editor.io.ProjectIO;
-import com.eliasmueller.llamamod.editor.io.ProjectInfo;
 import com.eliasmueller.llamamod.editor.io.Templates;
 import com.eliasmueller.llamamod.mods.levels.LevelProjects;
+import com.eliasmueller.llamamod.save.TestLevelChapters;
 import java.awt.BorderLayout;
 import java.awt.Component;
 import java.awt.Dimension;
@@ -12,11 +11,8 @@ import java.awt.Font;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.Insets;
-import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
 import javax.swing.BorderFactory;
 import javax.swing.BoxLayout;
 import javax.swing.ButtonGroup;
@@ -28,7 +24,7 @@ import javax.swing.JPanel;
 import javax.swing.JRadioButton;
 import javax.swing.JSpinner;
 import javax.swing.JTextField;
-import javax.swing.SpinnerNumberModel;
+import javax.swing.SpinnerListModel;
 import javax.swing.UIManager;

 /** New level: name, base level (object types, textures, sky, music), template, TestLevel chapter. */
@@ -51,7 +47,8 @@ final class NewLevelDialog extends JDialog {
                base.setSelectedItem(l);
            }
        }
-        JSpinner chapter = new JSpinner(new SpinnerNumberModel(nextFreeChapter(w), 1, 49, 1));
+        JSpinner chapter = new JSpinner(new SpinnerListModel(TestLevelChapters.all()));
+        chapter.setValue(LevelProjects.nextFreeChapter(w.env().levelsDir()));
        PicturePanel pic = new PicturePanel(300, 170);
        Runnable updatePic = () -> {
            OriginalLevels.Level l = (OriginalLevels.Level) base.getSelectedItem();
@@ -75,7 +72,8 @@ final class NewLevelDialog extends JDialog {
                row,
                "TestLevel chapter",
                chapter,
-                "The level replaces this chapter of world 9 (TestLevel) when it is enabled");
+                "The level replaces this chapter of world 9 (TestLevel) when it is enabled (32–49; 1 is the Test"
+                        + " World's)");
        JPanel templates = new JPanel();
        templates.setLayout(new BoxLayout(templates, BoxLayout.Y_AXIS));
        ButtonGroup g = new ButtonGroup();
@@ -161,26 +159,6 @@ final class NewLevelDialog extends JDialog {
        return row + 1;
    }

-    /** First TestLevel chapter from 2 that no project in the levels folder uses. */
-    static int nextFreeChapter(EditorWindow w) {
-        Set<Integer> used = new HashSet<>();
-        for (Path p : LevelProjects.list(w.env().levelsDir())) {
-            try {
-                ProjectInfo i = ProjectIO.info(Files.readAllBytes(p));
-                if (i.isNewLevel()) {
-                    used.add(i.targetChapter());
-                }
-            } catch (Exception e) {
-                // skip broken files
-            }
-        }
-        int c = 2;
-        while (used.contains(c) && c < 49) {
-            c++;
-        }
-        return c;
-    }
-
    Result result() {
        return result;
    }
@@ -15,6 +15,7 @@ import com.eliasmueller.llamamod.editor.model.cmd.AddNode;
 import com.eliasmueller.llamamod.editor.model.cmd.Batch;
 import com.eliasmueller.llamamod.editor.model.cmd.Command;
 import com.eliasmueller.llamamod.platform.Json;
+import com.eliasmueller.llamamod.save.TestLevelChapters;
 import java.awt.RenderingHints;
 import java.awt.image.BufferedImage;
 import java.io.File;
@@ -592,7 +593,7 @@ public final class ProjectController {
                ? String.format(
                        Locale.ROOT,
                        "T1L9M%03d",
-                        Math.max(1, d.scene().settings().targetChapter()))
+                        TestLevelChapters.migrate(d.scene().settings().targetChapter()))
                : d.base();
        fc.setSelectedFile(new File(fc.getCurrentDirectory(), stem + ".wad"));
        if (fc.showSaveDialog(w) != JFileChooser.APPROVE_OPTION) {
@@ -46,6 +46,10 @@ public final class ExeImage {
            return (characteristics & 0x20000000) != 0;
        }

+        public boolean writable() {
+            return (characteristics & 0x80000000) != 0;
+        }
+
        /** Bytes of the section that come from the file. */
        public long fileBackedSize() {
            return virtualSize == 0 ? rawSize : Math.min(virtualSize, rawSize);
@@ -70,6 +74,9 @@ public final class ExeImage {
    public record DynamicImport(String owner, String dll, String function, long slot) implements Op {}

    private final byte[] data;
+    /** The file as parsed, before any patch: {@link GameExe} resolves its sites here. */
+    private final byte[] original;
+
    private final int peOff;
    private final int optOff;
    private final long imageBase;
@@ -81,9 +88,11 @@ public final class ExeImage {
    private final Region dataRegion;
    private final List<Op> journal = new ArrayList<>();
    private String owner = "base";
+    private GameExe game;

    private ExeImage(byte[] exe) throws ExePatchException {
        data = exe.clone();
+        original = exe.clone();
        if (data.length < 0x40 || data[0] != 'M' || data[1] != 'Z') {
            throw new ExePatchException("Not a Windows executable (no MZ header)");
        }
@@ -157,12 +166,18 @@ public final class ExeImage {
        return va >= dataRegion.va;
    }

-    /** File offset of a VA in the original file, or -1 (not file-backed, e.g. .bss or the cave). */
+    /**
+     * File offset of a VA in the original file, or -1 (not file-backed, e.g. .bss or the cave). The
+     * PE headers are mapped at the image base, so they have VAs too (section flags can be patched).
+     */
    public int fileOffset(long va) {
        return fileOffset(va, 1);
    }

    private int fileOffset(long va, int len) {
+        if (va >= imageBase && va + len <= imageBase + headerSize()) {
+            return (int) (va - imageBase);
+        }
        for (Section s : sections) {
            if (s.containsFileBacked(va, len)) {
                return (int) (s.rawOffset() + (va - s.va()));
@@ -171,8 +186,11 @@ public final class ExeImage {
        return -1;
    }

-    /** VA of a file offset inside a section, or -1. */
+    /** VA of a file offset inside the headers or a section, or -1. */
    public long va(int fileOffset) {
+        if (fileOffset >= 0 && fileOffset < headerSize()) {
+            return imageBase + fileOffset;
+        }
        for (Section s : sections) {
            if (fileOffset >= s.rawOffset() && fileOffset < s.rawOffset() + s.fileBackedSize()) {
                return s.va() + (fileOffset - s.rawOffset());
@@ -181,6 +199,21 @@ public final class ExeImage {
        return -1;
    }

+    private int headerSize() {
+        return i32(optOff + 60); // SizeOfHeaders
+    }
+
+    /** File offset of the Characteristics field of section {@code name}'s header. */
+    public int sectionFlagsOffset(String name) {
+        int table = optOff + u16(peOff + 20);
+        for (int k = 0; k < sections.size(); k++) {
+            if (sections.get(k).name().equals(name)) {
+                return table + 40 * k + 36;
+            }
+        }
+        throw new IllegalArgumentException("No section " + name);
+    }
+
    // ---------------------------------------------------------------- reading

    public byte[] read(long va, int len) {
@@ -195,6 +228,26 @@ public final class ExeImage {
        return out;
    }

+    /** Bytes of the file as parsed (before any patch); file-backed section data only. */
+    public byte[] readOriginal(long va, int len) {
+        int off = fileOffsetChecked(va, len);
+        return Arrays.copyOfRange(original, off, off + len);
+    }
+
+    /** Build identification and version-independent sites of this executable. */
+    public GameExe game() {
+        if (game == null) {
+            game = new GameExe(this, original);
+        }
+        return game;
+    }
+
+    /** Like {@link #find(String, String)}, but on the file as parsed and stopping after {@code limit} hits. */
+    public List<Long> findOriginal(String sectionName, String pattern, int limit) {
+        Pattern p = Pattern.of(pattern);
+        return find(original, List.of(section(sectionName)), p.bytes, p.mask, limit);
+    }
+
    public int readU8(long va) {
        return read(va, 1)[0] & 0xff;
    }
@@ -237,8 +290,12 @@ public final class ExeImage {
    }

    private List<Long> find(byte[] pat, boolean[] mask, int limit) {
+        return find(data, sections, pat, mask, limit);
+    }
+
+    private static List<Long> find(byte[] data, List<Section> in, byte[] pat, boolean[] mask, int limit) {
        List<Long> out = new ArrayList<>();
-        for (Section s : sections) {
+        for (Section s : in) {
            int start = s.rawOffset();
            int end = s.rawOffset() + (int) s.fileBackedSize();
            outer:
@@ -0,0 +1,202 @@
+package com.eliasmueller.llamamod.exe;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.util.EnumMap;
+import java.util.HexFormat;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+/**
+ * Which groove.exe this is, and where the {@link Site}s are in it. Sites are resolved on the file
+ * as parsed (before any patch), so the order in which mods patch does not matter. A site that is
+ * not found exactly once means an unknown program version: {@link #va} throws with a message that
+ * names the build and the supported ones.
+ */
+public final class GameExe {
+    /** The known builds. */
+    public enum Build {
+        GERMAN("German", "2001-02-12", 1_642_496, "7832eda4ee47a717e94441f21b75a9f30d11445c9f2408c6135a8fc01812e95b"),
+        ENGLISH("English", "2000-10-17", 1_634_304, "bf0eb8829ed3e371c4e951ece0a7753acf2c28d07001b842e079b098576403b0");
+
+        public final String language;
+        /** PE timestamp (UTC date). */
+        public final String date;
+
+        public final int size;
+        public final String sha256;
+
+        Build(String language, String date, int size, String sha256) {
+            this.language = language;
+            this.date = date;
+            this.size = size;
+            this.sha256 = sha256;
+        }
+
+        public long va(Site s) {
+            return this == GERMAN ? s.german : s.english;
+        }
+
+        @Override
+        public String toString() {
+            return language + " version of " + date;
+        }
+    }
+
+    private final ExeImage img;
+    private final byte[] original;
+    private final Build build;
+    private final String sha256;
+    private final Map<Site, Long> sites = new EnumMap<>(Site.class);
+    private final Map<Site, Long> matches = new EnumMap<>(Site.class);
+
+    GameExe(ExeImage img, byte[] original) {
+        this.img = img;
+        this.original = original;
+        sha256 = sha256(original);
+        Build b = null;
+        for (Build k : Build.values()) {
+            if (k.sha256.equals(sha256)) {
+                b = k;
+            }
+        }
+        build = b;
+    }
+
+    /** SHA-256 of the file as parsed (hex). */
+    public String sha256() {
+        return sha256;
+    }
+
+    /** The known build, or null for any other groove.exe. */
+    public Build build() {
+        return build;
+    }
+
+    /** "German version of 2001-02-12" or "unknown version (PE date …, … bytes)". */
+    public String describe() {
+        if (build != null) {
+            return build.toString();
+        }
+        int pe = ByteBuffer.wrap(original).order(ByteOrder.LITTLE_ENDIAN).getInt(0x3c);
+        long ts = ByteBuffer.wrap(original).order(ByteOrder.LITTLE_ENDIAN).getInt(pe + 8) & 0xffffffffL;
+        return String.format(
+                Locale.ROOT,
+                "unknown version (PE date %s, %d bytes)",
+                Instant.ofEpochSecond(ts).atZone(ZoneOffset.UTC).toLocalDate(),
+                original.length);
+    }
+
+    /** Address of {@code s} in this executable. */
+    public long va(Site s) throws ExePatchException {
+        Long v = sites.get(s);
+        if (v == null) {
+            v = resolve(s);
+            sites.put(s, v);
+        }
+        return v;
+    }
+
+    /** Where the rule of {@code s} matched: its signature match, or the address in its base site. */
+    public long anchor(Site s) throws ExePatchException {
+        va(s);
+        return matches.get(s);
+    }
+
+    /** The original bytes at {@code s} as hex (expected bytes of a patch there). */
+    public String original(Site s, int len) throws ExePatchException {
+        return HexFormat.ofDelimiter(" ")
+                .formatHex(img.readOriginal(va(s), len))
+                .toUpperCase(Locale.ROOT);
+    }
+
+    private long resolve(Site s) throws ExePatchException {
+        Site.Rule r = s.rule;
+        long at;
+        if (r.pattern() != null) {
+            List<Long> hits = img.findOriginal(".text", r.pattern(), 2);
+            if (hits.size() != 1) {
+                throw unknown(s, hits.isEmpty() ? "not found" : "found more than once");
+            }
+            at = hits.getFirst() + r.offset();
+        } else {
+            at = va(r.base()) + r.offset();
+        }
+        matches.put(s, at);
+        long v =
+                switch (r.kind()) {
+                    case CODE -> at;
+                    case OPERAND -> {
+                        long a = u32(at);
+                        if (!inSection(a, ".data")) {
+                            throw unknown(s, String.format(Locale.ROOT, "address 0x%X is not in .data", a));
+                        }
+                        yield a;
+                    }
+                    case CALL_TARGET -> {
+                        long t = relTarget(at);
+                        if (t < 0) {
+                            throw unknown(s, "no call at " + ExeImage.hexVa(at));
+                        }
+                        yield t;
+                    }
+                };
+        if (r.calls() != null && relTarget(v) != va(r.calls())) {
+            throw unknown(s, "does not call " + r.calls().name());
+        }
+        return v;
+    }
+
+    /** Target of the call/jmp rel32 at {@code va}, or -1. */
+    private long relTarget(long va) {
+        int op = img.readOriginal(va, 1)[0] & 0xff;
+        if (op != 0xE8 && op != 0xE9) {
+            return -1;
+        }
+        return (va + 5 + (int) u32(va + 1)) & 0xffffffffL;
+    }
+
+    private long u32(long va) {
+        return ByteBuffer.wrap(img.readOriginal(va, 4))
+                        .order(ByteOrder.LITTLE_ENDIAN)
+                        .getInt()
+                & 0xffffffffL;
+    }
+
+    private boolean inSection(long va, String name) {
+        try {
+            ExeImage.Section sec = img.section(name);
+            return va >= sec.va() && va < sec.va() + Math.max(sec.virtualSize(), sec.rawSize());
+        } catch (IllegalArgumentException e) {
+            return false;
+        }
+    }
+
+    private ExePatchException unknown(Site s, String why) {
+        StringBuilder known = new StringBuilder();
+        for (Build b : Build.values()) {
+            known.append(known.isEmpty() ? "" : ", ").append(b);
+        }
+        return new ExePatchException(String.format(
+                Locale.ROOT,
+                "groove.exe (%s): %s (%s) %s – unknown program version. LlamaMod supports: %s.",
+                describe(),
+                s.name(),
+                s.description,
+                why,
+                known));
+    }
+
+    private static String sha256(byte[] b) {
+        try {
+            return HexFormat.of().formatHex(MessageDigest.getInstance("SHA-256").digest(b));
+        } catch (NoSuchAlgorithmException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}
@@ -0,0 +1,266 @@
+package com.eliasmueller.llamamod.exe;
+
+/**
+ * Named code sites and globals of groove.exe that LlamaMod patches or uses, with the rule that
+ * finds each one in any build ({@link GameExe#va}) and its address in the two known builds
+ * (German 2001-02-12 / English 2000-10-17; GameExeTest checks both).
+ *
+ * <p>Rules: {@code code} = unique match of a byte signature in .text ({@code ??} masks absolute
+ * addresses and rel32 operands, which differ between builds); {@code operand} = the absolute
+ * address stored at an offset of a signature match (or of another site); {@code callTarget} = the
+ * target of the rel32 call/jmp at a site. {@code calling(s)} additionally requires the instruction
+ * at the site to call {@code s}. Globals are never guessed: each is read from an instruction that
+ * uses it. To support another build see notes/llamamod-app.md ("groove.exe versions").
+ */
+public enum Site {
+    // boot to level
+    MENU_FRAME(
+            code("A1 ?? ?? ?? ?? 57 33 FF 3B C7 0F 85 ?? ?? ?? ??"),
+            0x549C50,
+            0x549990,
+            "state 2 (main menu) frame handler, starts with mov eax,[dword]"),
+    GAME_FRAME(
+            code("A1 ?? ?? ?? ?? 85 C0 0F 85 ?? ?? ?? ?? 83 3D ?? ?? ?? ?? 01"),
+            0x549F40,
+            0x549C80,
+            "state 3 (in game) frame handler, starts with mov eax,[dword]"),
+    DEMO_SWITCH(
+            code(
+                    "E8 ?? ?? ?? ?? 8B 15 ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 52 E8 ?? ?? ?? ?? 83 C4 04 E8 ?? ?? ?? ?? A1 ?? ?? ?? ?? 83 F8 04 75 58 8B 0D ?? ?? ?? ?? A3 ?? ?? ?? ?? 8B C1 C1 E0 04 41 8B 90 ?? ?? ?? ?? 83 F9 03 89 15 ?? ?? ?? ?? 8B 90 ?? ?? ?? ?? 89 15 ?? ?? ?? ?? 8B 90 ?? ?? ?? ?? 8B 80 ?? ?? ?? ?? 89 15 ?? ?? ?? ?? A3 ?? ?? ?? ?? 89 0D ?? ?? ?? ??"),
+            0x549E47,
+            0x549B87,
+            "main menu: music shutdown and switch to the attract demo (state 2 -> 4)"),
+    MUSIC_STOP(callTarget(DEMO_SWITCH), 0x546CC0, 0x546AF0, "music shutdown, part 1 (call at DEMO_SWITCH)"),
+    MUSIC_TRACK(operandAt(DEMO_SWITCH, 7), 0x6D94B4, 0x6D8B44, "current music track (pushed for MUSIC_PLAY)"),
+    MUSIC_ID(operandAt(DEMO_SWITCH, 13), 0x586430, 0x585AC0, "music id, zeroed before the switch"),
+    MUSIC_PLAY(callTarget(DEMO_SWITCH, 18), 0x546990, 0x5467C0, "music shutdown, part 2 (cdecl, 1 argument)"),
+    MUSIC_UPDATE(callTarget(DEMO_SWITCH, 26), 0x5464D0, 0x546350, "music shutdown, part 3"),
+    NEXT_STATE(operandAt(DEMO_SWITCH, 32), 0x584700, 0x583D90, "requested next game state"),
+    STATE(
+            operandAt(DEMO_SWITCH, 48),
+            0x5846E4,
+            0x583D74,
+            "game state (2 main menu, 3 in game, 6 save slots, 12 world map)"),
+    TRIBE(operandAt(DEMO_SWITCH, 69), 0x584EB4, 0x584544, "current tribe"),
+    WORLD(operandAt(DEMO_SWITCH, 81), 0x584EB8, 0x584548, "current world"),
+    CHAPTER(operandAt(DEMO_SWITCH, 99), 0x584EBC, 0x58454C, "current chapter"),
+    MAP(operandAt(DEMO_SWITCH, 104), 0x584EC0, 0x584550, "current map"),
+    READ_SLOTS(
+            code("81 EC 00 01 00 00 53 56 57 33 DB BF ?? ?? ?? ??"),
+            0x41C0E0,
+            0x41C050,
+            "reads the three save slot files"),
+    LOAD_SLOT(
+            code("A1 ?? ?? ?? ?? C7 05 ?? ?? ?? ?? 00 00 00 00 C1 E0 08"),
+            0x41CC70,
+            0x41CB80,
+            "loads save slot SLOT (or starts a new game in it)"),
+    SUB_STATE(operand("C7 05 ?? ?? ?? ?? 04 00 00 00 EB 10", 2), 0x584638, 0x583CC8, "menu sub-state"),
+    MAP_TRIBE(operand("A0 ?? ?? ?? ?? 8D BA ?? ?? ?? ?? C1 E9 0C", 1), 0x585588, 0x584C18, "world map: tribe"),
+    MAP_WORLD(operand("89 15 ?? ?? ?? ?? A3 ?? ?? ?? ?? 5E", 2), 0x584C24, 0x5842B4, "world map: world"),
+    MAP_CHAPTER(
+            operand("8B 15 ?? ?? ?? ?? A3 ?? ?? ?? ?? A0 ?? ?? ?? ??", 2), 0x584C20, 0x5842B0, "world map: chapter"),
+    MAP_MAP(operand("A3 ?? ?? ?? ?? 5E 83 C4 60 C3 90 90", 1), 0x58557C, 0x584C0C, "world map: map"),
+    FROM_MAIN_MENU(
+            operand("39 1D ?? ?? ?? ?? 74 6E A1 ?? ?? ?? ??", 2),
+            0x5855B0,
+            0x584C40,
+            "set when the save slots are opened from the main menu"),
+    SLOT(operand("A1 ?? ?? ?? ?? 83 F8 FF 75 31 33 C9", 1), 0x584C28, 0x5842B8, "selected save slot (0-2)"),
+    PRESSED(
+            operand("A1 ?? ?? ?? ?? 25 00 40 00 00 74 36", 1),
+            0x5FCF08,
+            0x5FC598,
+            "control bits pressed this frame (0x8 = pause)"),
+    // cheats
+    STARTUP_CALL(
+            code("E8 ?? ?? ?? ?? E8 ?? ?? ?? ?? 84 C0 75 15"),
+            0x41D3EA,
+            0x41D2BA,
+            "WinMain: call right after the command line was parsed"),
+    STARTUP_TARGET(callTarget(STARTUP_CALL), 0x41C050, 0x41BFC0, "function called at STARTUP_CALL"),
+    CHEAT_FLAGS(
+            operand("8B 0D ?? ?? ?? ?? 85 C8 75 3A 6A 08", 2),
+            0x584710,
+            0x583DA0,
+            "cheat bits toggled by the main-menu codes"),
+    DISPLAY_DIAGNOSTICS(
+            operand("C6 05 ?? ?? ?? ?? 01 68 ?? ?? ?? ??", 2),
+            0x5834D0,
+            0x582B60,
+            "-display_diagnostics switch (byte)"),
+    // intro skip
+    LOGOS(
+            code("68 ?? ?? ?? ?? E8 ?? ?? ?? ?? A1 ?? ?? ?? ?? 83 C4 08"),
+            0x41D56E,
+            0x41D43E,
+            "WinMain: push offset disneylogompeg.dat, first instruction of the logo block"),
+    AFTER_LOGOS(
+            code("E8 ?? ?? ?? ?? E8 ?? ?? ?? ?? 6A 2C"),
+            0x41D5D3,
+            0x41D4A3,
+            "WinMain: first instruction after the logo block"),
+    DEMO_IDLE_JBE(
+            code("76 41 A1 ?? ?? ?? ?? 6A 01 A3 ?? ?? ?? ??"),
+            0x549DC0,
+            0x549B00,
+            "main menu: jbe of the idle check (1800 frames -> attract demo)"),
+    STORY_INTRO(
+            code("E8 ?? ?? ?? ?? A1 ?? ?? ?? ?? 83 C4 08 83 F8 04"),
+            0x54AEC9,
+            0x54ABD9,
+            "call of the movie player for %d%d%dINTRO.DAT"),
+    MOVIE_PLAYER(callTarget(STORY_INTRO), 0x41F630, 0x41F4B0, "movie player (called at STORY_INTRO)"),
+    STORY_EULOGY(
+            code("E8 ?? ?? ?? ?? A1 ?? ?? ?? ?? 68 ?? ?? ?? ?? A3 ?? ?? ?? ??").calling(MOVIE_PLAYER),
+            0x54B138,
+            0x54AE48,
+            "call of the movie player for EULOGY.DAT"),
+    STORY_OUTRO(
+            code("E8 ?? ?? ?? ?? 68 ?? ?? ?? ?? E8 ?? ?? ?? ?? 6A 03").calling(MOVIE_PLAYER),
+            0x54B26F,
+            0x54AF7F,
+            "call of the movie player for %d%d%dOUTRO.DAT"),
+    // practice
+    TICK_CALL(
+            code("E8 ?? ?? ?? ?? E8 ?? ?? ?? ?? 8B 15 ?? ?? ?? ?? A1 ?? ?? ?? ?? 42"),
+            0x54B77E,
+            0x54B48E,
+            "game loop: per-tick call of STRAT_UPDATE"),
+    STRAT_UPDATE(callTarget(TICK_CALL), 0x54C4A0, 0x54C1B0, "strat update (one logic tick of all objects)"),
+    PLAYER(operand("A1 ?? ?? ?? ?? 83 C4 0C 46 83 C7 10", 1), 0x6D9E1C, 0x6D94A4, "player (llama) strat pointer"),
+    // free camera
+    CAM_CALL_RUNNING(
+            code("E8 ?? ?? ?? ?? E8 ?? ?? ?? ?? 5F 5E 5D C3 89 2D ?? ?? ?? ??"),
+            0x54B79F,
+            0x54B4AF,
+            "frame: call of CAM_UPDATE while running"),
+    CAM_UPDATE(callTarget(CAM_CALL_RUNNING), 0x54BAD0, 0x54B7E0, "copies the camera strat into the render camera"),
+    CAM_CALL_PAUSED(
+            code("E8 ?? ?? ?? ?? E8 ?? ?? ?? ?? 5F 5E 5D C3 90").calling(CAM_UPDATE),
+            0x54B7E0,
+            0x54B4F0,
+            "frame: call of CAM_UPDATE while paused"),
+    TICK_AFTER_STRATS(
+            code("E8 ?? ?? ?? ?? 8B 15 ?? ?? ?? ?? A1 ?? ?? ?? ?? 42"),
+            0x54B783,
+            0x54B493,
+            "tick loop: call of PARTICLES right after TICK_CALL"),
+    PARTICLES(callTarget(TICK_AFTER_STRATS), 0x4287C0, 0x428630, "particle update"),
+    AFTER_INPUT(
+            code("E8 ?? ?? ?? ?? A0 ?? ?? ?? ?? 84 C0 74 09"),
+            0x54B5FD,
+            0x54B30D,
+            "frame: call right after the frame's input read"),
+    AFTER_INPUT_TARGET(callTarget(AFTER_INPUT), 0x427C40, 0x427AB0, "function called at AFTER_INPUT"),
+    PAD_BITS(
+            code("8B 44 24 04 83 EC 08 53 33 DB 3B C3"),
+            0x4256C0,
+            0x425540,
+            "pad structs -> control bits (int argument)"),
+    REGIONS_CALL_FRAME(
+            code("E8 ?? ?? ?? ?? A1 ?? ?? ?? ?? BF 04 00 00 00"),
+            0x54B614,
+            0x54B324,
+            "frame: call of REGIONS before the ticks"),
+    REGIONS(callTarget(REGIONS_CALL_FRAME), 0x41E020, 0x41DEA0, "region mask (rooms to draw) from the camera cell"),
+    REGIONS_CALL_RUNNING(
+            code("E8 ?? ?? ?? ?? 5F 5E 5D C3 89 2D ?? ?? ?? ??").calling(REGIONS),
+            0x54B7A4,
+            0x54B4B4,
+            "frame: call of REGIONS after CAM_CALL_RUNNING"),
+    REGIONS_CALL_PAUSED(
+            code("E8 ?? ?? ?? ?? 5F 5E 5D C3 90 90 E9 ?? ?? ?? ??").calling(REGIONS),
+            0x54B7E5,
+            0x54B4F5,
+            "frame: call of REGIONS after CAM_CALL_PAUSED"),
+    STRAT_RESET(
+            code(
+                    "89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ?? 89 3D ?? ?? ?? ??"),
+            0x54D0D5,
+            0x54CDE5,
+            "level start (strat system reset): mov [dword],edi"),
+    TICKS(
+            operand("89 35 ?? ?? ?? ?? 8B 0D ?? ?? ?? ??", 2),
+            0x5724D4,
+            0x5724D8,
+            "logic ticks this frame (30 per second)"),
+    PAUSED(operand("A1 ?? ?? ?? ?? 83 C4 10 85 C0 74 53", 1), 0x584640, 0x583CD0, "pause flag"),
+    CONTROLS(operand("A3 ?? ?? ?? ?? 7E 0A B8 10 00 00 00", 1), 0x5FCF20, 0x5FC5B0, "held control bits"),
+    STICK(operand("8B 3D ?? ?? ?? ?? 83 FF 2A 0F 83 ?? ?? ?? ??", 2), 0x5FCEFC, 0x5FC58C, "stick magnitude"),
+    DEMO(operand("8B 0D ?? ?? ?? ?? 3B CB 89 1D ?? ?? ?? ??", 2), 0x5FCF3C, 0x5FC5CC, "demo playback active"),
+    PAD_COUNT(operand("3B 2D ?? ?? ?? ?? 0F 83 ?? ?? ?? ??", 2), 0x5FCF6C, 0x5FC5FC, "number of pad structs"),
+    PADS(operand("89 3D ?? ?? ?? ?? 75 04 32 C0 5F C3", 2), 0x5FCF70, 0x5FC600, "pad structs (12 bytes each)"),
+    PITCH(
+            operand("A3 ?? ?? ?? ?? A1 ?? ?? ?? ?? 89 0D ?? ?? ?? ??", 1),
+            0x5790A0,
+            0x5790A0,
+            "render camera pitch (4096 = 360 degrees)"),
+    YAW(operand("66 8B 0D ?? ?? ?? ?? 89 1D ?? ?? ?? ??", 3), 0x5790A4, 0x5790A4, "render camera yaw"),
+    CAM_X(operand("8B 15 ?? ?? ?? ?? 8B 01 8B 49 08 2B C2", 2), 0x5790B0, 0x5790B0, "render camera position x, y, z"),
+    TARGET_X(
+            operand("68 ?? ?? ?? ?? E8 ?? ?? ?? ?? 8B 54 24 1C", 1),
+            0x6D9D80,
+            0x6D9408,
+            "render camera target x, y, z"),
+    SINE(operand("8B 1C 8D ?? ?? ?? ?? 8B C8 0F AF CA", 3), 0x574318, 0x574318, "s32[4096] sine table, 4096 = 1.0"),
+    // base patch: level record relocation
+    COINS(
+            operand("8B 34 B5 ?? ?? ?? ?? C1 EE 0C 3B F2", 3),
+            0x584F1C,
+            0x5845AC,
+            "u32 coin counters [world*6 + chapter], 54 rows"),
+    FLAGS(
+            operand("BE ?? ?? ?? ?? C6 82 ?? ?? ?? ?? 01", 1),
+            0x584EC8,
+            0x584558,
+            "u8 chapter flags [world*6 + chapter], 54 rows");
+
+    final Rule rule;
+    /** Address in the German build (2001-02-12). */
+    public final long german;
+    /** Address in the English build (2000-10-17). */
+    public final long english;
+
+    public final String description;
+
+    Site(Rule rule, long german, long english, String description) {
+        this.rule = rule;
+        this.german = german;
+        this.english = english;
+        this.description = description;
+    }
+
+    enum Kind {
+        CODE,
+        OPERAND,
+        CALL_TARGET
+    }
+
+    /** {@code pattern} null: relative to {@code base}. */
+    record Rule(Kind kind, String pattern, Site base, int offset, Site calls) {
+        Rule calling(Site s) {
+            return new Rule(kind, pattern, base, offset, s);
+        }
+    }
+
+    private static Rule code(String pattern) {
+        return new Rule(Kind.CODE, pattern, null, 0, null);
+    }
+
+    private static Rule operand(String pattern, int offset) {
+        return new Rule(Kind.OPERAND, pattern, null, offset, null);
+    }
+
+    private static Rule operandAt(Site base, int offset) {
+        return new Rule(Kind.OPERAND, null, base, offset, null);
+    }
+
+    private static Rule callTarget(Site base) {
+        return callTarget(base, 0);
+    }
+
+    private static Rule callTarget(Site base, int offset) {
+        return new Rule(Kind.CALL_TARGET, null, base, offset, null);
+    }
+}
Author	SHA1	Message	Date
MineTec	d32d197b54	0.2.3 build / build (push) Successful in 1m5s Details release / release (push) Successful in 3m18s Details	2026-11-07 21:18:12 +01:00
MineTec	0568ae7f24	exit logic corrected from in-game debugging: the leveldoor only sets g101-g105, the llama's script ends the level (material 16, exit cell, near the floor); stale floor record after a position jump explains the hover exit skip in jungle day 2	2026-11-07 20:57:15 +01:00
MineTec	64259ea15b	fly key capture lets shift, ctrl and alt through, so the play-here crosshair no longer sticks after flying fast	2026-11-07 19:32:45 +01:00
MineTec	322e36c0f3	toolbar block icons centred in their 16px box (test for all icons), tutorials say where the objects tab is	2026-11-07 19:09:39 +01:00
MineTec	52c70e817d	editor: fly keys work while another component has the keyboard focus (window-wide key dispatcher during right-mouse fly), held keys cleared when the flight ends	2026-11-07 19:03:20 +01:00
MineTec	1cc59bfb78	0.2.2 build / build (push) Successful in 49s Details release / release (push) Successful in 1m31s Details	2026-11-07 18:34:32 +01:00
MineTec	932ccf5fc8	warning dialog for unsupported groove.exe versions at start and before the first apply of a session (nothing blocked)	2026-11-07 18:32:42 +01:00
MineTec	ff6673af66	readme and docs: german and english game versions supported, what happens with other versions	2026-11-07 18:17:31 +01:00
MineTec	ca22c75fac	english groove.exe (2000-10-17) supported next to the german one: named exe sites found by signatures per build (german patches byte-identical), base patch and every exe mod on both, unknown builds get a clear message; display diagnostics moved to troubleshooting with a warning (it flashes every monitor black)	2026-11-07 18:14:15 +01:00
MineTec	f984019199	gitignore the english groove.exe used for version support	2026-11-07 17:31:02 +01:00
MineTec	abe97b6977	changelog: alligator arena, documentation and known limits for 0.2.1; current launcher and editor screenshots everywhere, coaster in the readme pictures build / build (push) Successful in 57s Details release / release (push) Successful in 1m16s Details	2026-11-07 16:51:40 +01:00
MineTec	bc8408d963	save path of the relocated coin and flag arrays verified in game: saves after finishing jungle 2 and village 1 byte-identical to the old exe, testlevel coins never reach the save	2026-11-07 16:51:16 +01:00
MineTec	a64df88c77	release automation: gitea actions build every push and publish tagged releases (version from the tag, packages, sha256sums, changelog section as text), simple 5-step install guide in the readme	2026-11-07 16:47:42 +01:00
MineTec	f5fd411592	llama coaster: ride the catacombs coaster cart on a new track (loop or grand circuit with drops, climbs, boosts, spin pads and jumps), 1-3 laps, three speeds, coins; offline cart simulation checks every jump and climb; roller coaster chapter in the strats docs	2026-11-07 16:45:54 +01:00
MineTec	6d449257a7	tool paths configurable by environment (LLAMAMOD_CD, LAMA_WINEPREFIX, LAMA_MOD, APPTEST_ROOT, APPTEST_ISO; tools/lamapaths.py), music tracks without a file on the cd marked in the editor and the tutorial uses kronk, levelbuild.py accepts the english texture names	2026-11-07 16:34:17 +01:00
MineTec	a0d961357e	readme: large current screenshots of the launcher and of the editor with an open level, outside the picture table	2026-11-07 16:19:26 +01:00
MineTec	624718b893	documentation for level builders: docs index, step-by-step guide, file format reference (wad, geometry, objects, textures, audio, testlevel chapters, engine limits), strat vm and script language with the arena as worked example, tools overview, developer notes; readme rewritten as project front page with screenshots; review notes moved to notes/dev	2026-11-07 16:14:40 +01:00
MineTec	00b2880d67	base exe patch moves the per-chapter coin and flag arrays into free .data space (128 entries), so every testlevel chapter is safe (revision 2, caches rebuilt once); new projects start on a free chapter from 32, manual shows number ranges, texture swatch caches follow texture edits, stray levelbau.md.orig removed	2026-11-07 15:52:00 +01:00
MineTec	d6b852a1b6	testlevel chapters 2-31 overwrite game memory (coin counter and flag rows end after world 8: progress, language, options): level projects, play-tests and the arena use chapters 1 and 32-49, old settings migrate; level tally counts the level's own coins and secrets	2026-11-07 15:27:08 +01:00
MineTec	987b0104fa	levelbuild texture names mean the same picture on every base level (matched by pixels, missing village textures copied over in the java builder, clear error otherwise), editor texture choices follow the base	2026-11-07 15:27:08 +01:00