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OpenTTD GitHub
Contributing to OpenTTD - guidelines
OpenTTD Doxygen
Coding style
Compiling OpenTTD
Debugging
Add a setting
Add a squirrel function
Understanding the SaveGame handler
Bumping the savegame version
Doing an OpenTTD release
Manual of style
Format of langfiles
Using OpenTTD strings
List of special strings
Using the window system
Colour codes that exist in OpenTTD
Adding a text box
Understanding the widget focus system
GUI style guide
The OpenTTD TCP protocol
The OpenTTD UDP protocol
Debugging desyncs
Server Admin Port development
The console window
Console commands
Console variables
Using console scripting
Adding functions/commands to the console
Adding variables to the console
Console development history
Graphics and similar (NewGRF)
AI framework (NoAI)
GameScript framework (NoGO)
Social Integration
Map array (landscape grid)
Vehicles
Pathfinding
Train acceleration
Sound IDs
The following information has not been confirmed for accuracy and may not be correct
Savegame File Format
Savegame files (including scenario files) consist of an 8-byte header followed by the actual savegame data in a compressed or plain form. Four types of file formats are supported by OpenTTD so far.
Header
| Offset | Size | Description |
| 0 | 4 bytes | Savegame format tag in plain text (see below) |
| 4 | uint32 | Savegame version in big endian format (currently it's SAVEGAME_VERSION * 0x10000) |
Savegame Format Tag
| Tag | Savegame body format |
| OTTD | Data compressed using LZO |
| OTTN | Plain data |
| OTTZ | Data compressed using Zlib |
| OTTX | Data compressed using LZMA |