In this expansion pack for DOOM³, return to the devastated facilities on Mars (where the unexplained disaster took place two years prior) to find a beacon buried in the ruins. There are new enemies, weapons, locations and puzzles - and multiplayer for up to 8 players. The Xbox version introduces new multiplayer maps for up to four players with various modes: Deathmatch, Team Deathmatch, Last Man Standing and Tournament, via System Link or Xbox Live. It also contains classic DOOM content: Ultimate DOOM, DOOM II and the DOOM's Master Levels version. You can play those in single player, cooperative or with deathmatch for up to 4 players on a split screen.