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 Hexen is a port of Raven Software's 1995 game "Hexen" that aims to behave as similar to the original DOS version of Hexen as possible.

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