In the next chapter of the DOOM 3 saga, the UAC returns to the abandoned facilities on Mars to investigate a mysterious beacon buried deep in the ruins of the ancient civilization. New Dramatic storyline and pulse-pounding action - All-new levels, beasts and powerful weapons, including the return of the double barreled Shotgun. Possess demonic powers to defeat your enemy - Harness the force of gravity to control your environment and control time to evade deadly traps. Multiplayer action - New multiplayer maps playable over Xbox Live or via System Link. Classic content - Ultimate DOOM, DOOM II, and all new. Master Levels for DOOM II classic content, playable in single player, split-screen 2-4 player co-op and deathmatch modes.