Classic Doom for Doom 3

Classic Doom for Doom 3 (also known as Classic Doom 3, mod name cdoom) is a Doom 3 mod. It recreates the entire Knee-Deep in the Dead shareware episode of Doom; other episodes are not recreated due to copyright and licensing issues (since the mod is freely distributed, without specific authorisation from id Software, the authors felt it was okay to recreate only the first episode which was originally freely distributed as well).

The mod supports single-player game, as well as deathmatch. When coupled with the Last Man Standing Coop mod, it's also possible to play through the game cooperatively.

Major differences between the original and CDoom

 * Some machinima bits have been added.
 * Map isn't available, nor is the PDA functionality used.
 * Enemy placement is slightly different.
 * Different, but reasonably equivalent, enemies are used. For example, instead of Troopers, Z-Secs are used.