You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Go to file
Tyler Trahan e26d3de5fb
Doc: Add guide to releasing OpenTTD (#10563)
3 days ago
.github Codechange: [CodeQL] Disable CodeQL check on trivial switch statements (#10537) 3 days ago
bin Change: Heading for 14 now. (#10302) 3 months ago
cmake Fix: build on platforms without native atomic 4 weeks ago
docs Doc: Add guide to releasing OpenTTD (#10563) 3 days ago
media Add: Slope-aware and roadtype-specific one-way sprites. (#10282) 3 months ago
os Fix: Ensure logo for Windows Store common assets package is named correctly 2 months ago
regression Codechange: Don't store tree counter in the map array (#10018) 4 weeks ago
src Fix: [Script] Access to enum/consts defined outside of main.nut (#10573) 3 days ago
.dorpsgek.yml Change: [DorpsGek] also announce Discussion creation/comments from GitHub (#8991) 2 years ago
.editorconfig Add: Include basic .editorconfig file to help enforce tab style (#6707) 5 years ago
.gitignore Fix: [Git] ignore any build folder you might have 2 years ago
CMakeLists.txt Fix: build on platforms without native atomic 4 weeks ago Doc: Add Coding Style into the repo for easier access (#10512) 3 weeks ago Add: use https:// for content-service connections (#10448) 1 month ago Fix: Typo and grammatical correction in (#10085) 5 months ago Doc: use a markdown version of GPL v2 for, also restore a missing line about copying to the GPL v2 wording 3 years ago Add: create bundles via CPack 3 years ago Update: Developer credits (#10190) 4 months ago Fix: warnings about obsolete settings/setting values in Doxygen configurations 2 months ago Cleanup: The readme is for people building/packaging OpenTTD. Player-focussed manuals are in the Wiki. (#10026) 6 months ago
changelog.txt Doc: Prepare for 13.0-beta2 release (#10149) 4 months ago
known-bugs.txt Change: rebrand 1.12.0 to 12.0 2 years ago


Table of contents

1.0) About

OpenTTD is a transport simulation game based upon the popular game Transport Tycoon Deluxe, written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.

OpenTTD is licensed under the GNU General Public License version 2.0, but includes some 3rd party software under different licenses. See the section "Licensing" below for details.

1.1) Downloading OpenTTD

OpenTTD can be downloaded from the official OpenTTD website.

Both 'stable' and 'nightly' versions are available for download:

  • most people should choose the 'stable' version, as this has been more extensively tested
  • the 'nightly' version includes the latest changes and features, but may sometimes be less reliable

OpenTTD is also available for free on Steam,, and the Microsoft Store. On some platforms OpenTTD will be available via your OS package manager or a similar service.

1.2) OpenTTD gameplay manual

OpenTTD has a community-maintained wiki, including a gameplay manual and tips.

1.3) Supported platforms

OpenTTD has been ported to several platforms and operating systems.

The currently supported platforms are:

  • Linux (SDL (OpenGL and non-OpenGL))
  • macOS (universal) (Cocoa)
  • Windows (Win32 GDI / OpenGL)

Other platforms may also work (in particular various BSD systems), but we don't actively test or maintain these.

1.3.1) Legacy support

Platforms, languages and compilers change. We'll keep support going on old platforms as long as someone is interested in supporting them, except where it means the project can't move forward to keep up with language and compiler features.

We guarantee that every revision of OpenTTD will be able to load savegames from every older revision (excepting where the savegame is corrupt). Please report a bug if you find a save that doesn't load.

1.4) Installing and running OpenTTD

OpenTTD is usually straightforward to install, but for more help the wiki includes an installation guide.

OpenTTD needs some additional graphics and sound files to run.

For some platforms these will be downloaded during the installation process if required.

For some platforms, you will need to refer to the installation guide.

1.4.1) Free graphics and sound files

The free data files, split into OpenGFX for graphics, OpenSFX for sounds and OpenMSX for music can be found at:

Please follow the readme of these packages about the installation procedure. The Windows installer can optionally download and install these packages.

1.4.2) Original Transport Tycoon Deluxe graphics and sound files

If you want to play with the original Transport Tycoon Deluxe data files you have to copy the data files from the CD-ROM into the baseset/ directory. It does not matter whether you copy them from the DOS or Windows version of Transport Tycoon Deluxe. The Windows install can optionally copy these files.

You need to copy the following files:

  • trg1r.grf or TRG1.GRF
  • trgcr.grf or TRGC.GRF
  • trghr.grf or TRGH.GRF
  • trgir.grf or TRGI.GRF
  • trgtr.grf or TRGT.GRF

1.4.3) Original Transport Tycoon Deluxe music

If you want the Transport Tycoon Deluxe music, copy the appropriate files from the original game into the baseset folder.

  • TTD for Windows: All files in the gm/ folder ( up to
  • TTD for DOS: The GM.CAT file
  • Transport Tycoon Original: The GM.CAT file, but rename it to GM-TTO.CAT

1.5) Add-on content / mods

OpenTTD features multiple types of add-on content, which modify gameplay in different ways.

Most types of add-on content can be downloaded within OpenTTD via the 'Check Online Content' button in the main menu.

Add-on content can also be installed manually, but that's more complicated; the OpenTTD wiki may offer help with that, or the OpenTTD directory structure guide.

1.6) OpenTTD directories

OpenTTD uses its own directory structure to store game data, add-on content etc.

For more information, see the directory structure guide.

1.7) Compiling OpenTTD

If you want to compile OpenTTD from source, instructions can be found in

2.0) Contact and Community

'Official' channels

'Unofficial' channels

2.1) Contributing to OpenTTD

We welcome contributors to OpenTTD. More information for contributors can be found in

2.2) Reporting bugs

Good bug reports are very helpful. We have a guide to reporting bugs to help with this.

Desyncs in multiplayer are complex to debug and report (some software development skils are required). Instructions can be found in debugging and reporting desyncs.

2.3) Translating

OpenTTD is translated into many languages. Translations are added and updated via the online translation tool.

3.0) Licensing

OpenTTD is licensed under the GNU General Public License version 2.0. For the complete license text, see the file ''. This license applies to all files in this distribution, except as noted below.

The squirrel implementation in src/3rdparty/squirrel is licensed under the Zlib license. See src/3rdparty/squirrel/COPYRIGHT for the complete license text.

The md5 implementation in src/3rdparty/md5 is licensed under the Zlib license. See the comments in the source files in src/3rdparty/md5 for the complete license text.

The implementations of Posix getaddrinfo and getnameinfo for OS/2 in src/3rdparty/os2 are distributed partly under the GNU Lesser General Public License 2.1, and partly under the (3-clause) BSD license. The exact licensing terms can be found in src/3rdparty/os2/getaddrinfo.c resp. src/3rdparty/os2/getnameinfo.c.

The fmt implementation in src/3rdparty/fmt is licensed under the MIT license. See src/3rdparty/fmt/LICENSE.rst for the complete license text.

4.0 Credits