Up to four players can play through the whole singleplayer campaign together thanks to this mod.
This mod adds solid support for Doom 3 Co-op as well as the expansion Resurrection of Evil. Plus a Hellwave mode to spice up deathmatch maps.
It is available e.g. on ModDB.
This page contains co-op info for DOOM 3: OpenCoop (Mod) on the PC. All information about DOOM 3: OpenCoop (Mod) was correct at the time of posting. Information is subject to change. If you see any errors please email us.