Binary package “chocolate-doom” in ubuntu xenial

Doom engine closely-compatible with Vanilla Doom

 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 Doom is a port of Id Software's 1993 game "Doom" that is designed
 to behave as similar to the original DOS version of Doom as is possible.
 Chocolate Doom requires game data to play. Free game data is available in the
 freedm package. Commercial game data can be packaged using
 "game-data-packager". Chocolate Doom supports all flavors of Doom, including
 The Ultimate Doom, Doom 2 and Final Doom as well as Chex(R) Quest, HACX and