This fork introduced slow pace mode, main documentation is in SlowPace.md.
Below you can find contents of legacy Readme.md.
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.
OpenTTD can be downloaded from the official OpenTTD website.
Both 'stable' and 'nightly' versions are available for download:
OpenTTD is also available for free on Steam, GOG.com, and the Microsoft Store. On some platforms OpenTTD will be available via your OS package manager or a similar service.
OpenTTD has a community-maintained wiki, including a gameplay manual and tips.
OpenTTD has been ported to several platforms and operating systems.
The currently supported platforms are:
Other platforms may also work (in particular various BSD systems), but we don't actively test or maintain these.
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.
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.
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.
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:
If you want the Transport Tycoon Deluxe music, copy the appropriate files from the original game into the baseset folder.
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.
OpenTTD uses its own directory structure to store game data, add-on content etc.
For more information, see the directory structure guide.
If you want to compile OpenTTD from source, instructions can be found in COMPILING.md.
'Official' channels
'Unofficial' channels
We welcome contributors to OpenTTD. More information for contributors can be found in CONTRIBUTING.md
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.
OpenTTD is translated into many languages. Translations are added and updated via the online translation tool.
OpenTTD is licensed under the GNU General Public License version 2.0. For the complete license text, see the file 'COPYING.md'. 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.
See CREDITS.md