Chocolate Doom aims to accurately reproduce the original DOS version of Doom and other games based on the Doom engine in a form that can be run on modern computers. Originally, Chocolate Doom was only a Doom source port. The project now includes ports of Heretic and Hexen, and Strife. Chocolate Doom's aims are: * To always be 100% Free and Open Source software. * Portability to as many different operating systems as possible. * Accurate reproduction of the original DOS versions of the games, including bugs. * Compatibility with the DOS demo, configuration and savegame files. * To provide an accurate retro "feel" (display and input should behave the same). This is a game engine - the data files are not included.