I do not play these games my husband and kids do , so i looked up the information on the game and yes its a 2 player and from the cover it i would say you defeat demons .
Science has unlocked the gates to the unknown. A sci-fi horror masterpiece, DOOM 3® is like nothing you’ve ever experienced. Dramatic storyline, pulse-pounding action, incredible graphics, and revolutionary technology combine to draw you into the most frightening and gripping first-person gaming experience ever created. Fight for your life in single player, online multiplayer, or the Xbox Live™ exclusive co-op mode.
* Chaos and horror: Face terrifying enemiesin yourdescent from a demon-infested UAC research station on Mars to the very depths of Hell. * Disturbingly realistic: Experience id Software's revolutionary new 3-D graphics engine as youundertake an epicbattle against pure evil. * Bring a friend: Fight your way through the terror with a teammate in the exclusive two-player co-op mode. * Online multiplayer: Test your nerves in team- or deathmatch-based multiplayer over Xbox Live.
I will destroy all in my path in order to obtain this fine product of joy!!! alas, i've said enough for you all to be aware that this item of beauty and passion will forever entertain!! hear ye, fellow gamers, for i suggest this game to yooooouuuuuuu!!!!!!!!