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. Unlike most modern Doom engines, Chocolate Doom is not derived from the Boom source port and does not inherit its features (or bugs).

Chocolate Heretic is a port of Raven Software's 1994 game "Heretic" that aims to behave as similar to the original DOS version of Heretic as possible.

Chocolate Heretic requires game data to play. Commercial game data can be packaged using "game-data-packager".