OpenRCT2 is an open-source re-implementation of RollerCoaster Tycoon 2 (RCT2), a popular construction and management simulation video game. The project aims to enhance the original game with new features, bug fixes, and improvements while maintaining the classic gameplay experience. OpenRCT2 provides support for modern operating systems, higher resolutions, and multiplayer capabilities, making it a favorite among fans of the original game.