OpenTTD is an open-source simulation game based on Transport Tycoon Deluxe, offering a range of features including bigger maps, stable multiplayer mode, and enhanced gameplay mechanics. The game is licensed under the GNU General Public License version 2.0 and has a large community of players and developers. OpenTTD has been translated into over 50 languages and has a wide range of configuration settings to tune the game to individual preferences. The game's features and gameplay mechanics are designed to mimic the original game as closely as possible while extending it with new features.