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Add Kaitai Struct definition for world database files (.wdb) (#1735)
2026-01-31 21:01:38 +01:00

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LEGO Island File Format Documentation

This folder contains documentation for LEGO Island's custom binary file formats using Kaitai Struct, a declarative language for describing binary data structures.

What is Kaitai Struct?

Kaitai Struct allows you to define binary formats in a YAML-based .ksy file, which can then be:

image

Documented Formats

File Extension Description
savegame.ksy .GS Main game save data (game state, progress, customizations)
players.ksy .gsi Player profile save data (usernames)
history.ksy .gsi Score history and high scores
animation.ksy .ani Animation data (keyframes, actor references, camera animation)
wdb.ksy .wdb World database (textures, parts, models, ROI hierarchies, LODs)

Using the Tools

Installation

See the Kaitai Struct Visualizer installation instructions for setup details.

Kaitai Struct Visualizer (ksv)

The Kaitai Struct Visualizer (ksv) provides an interactive terminal UI for exploring binary files.

# View a save game file
ksv samples/G0.GS savegame.ksy

# View a Players.gsi file
ksv samples/Players.gsi players.ksy

# View a History.gsi file
ksv samples/History.gsi history.ksy

# View an animation file
ksv samples/pns065rd.ani animation.ksy

# View the world database (from game installation)
ksv /path/to/lego/data/world.wdb wdb.ksy

Kaitai Struct Dump (ksdump)

ksdump outputs the parsed structure as JSON or YAML for scripting and inspection.

# Dump a save game to JSON
ksdump --format json samples/G0.GS savegame.ksy

# Dump Players.gsi to JSON
ksdump --format json samples/Players.gsi players.ksy

# Dump History.gsi to YAML
ksdump --format yaml samples/History.gsi history.ksy

# Dump an animation file to JSON
ksdump --format json samples/pns065rd.ani animation.ksy

# Dump world database to YAML (from game installation)
ksdump --format yaml /path/to/lego/data/world.wdb wdb.ksy

Sample Files

The samples/ directory contains example files for testing:

  • G0.GS, G1.GS, G2.GS - Sample main game save files (slots 0, 1, 2)
  • Players.gsi - Sample player profile data
  • History.gsi - Sample score history data
  • pns065rd.ani - Sample animation file

Note: The world database (world.wdb) can be found in your LEGO Island installation at lego/data/world.wdb.