Co-Op

Black Ops is a first-person shooter, retaining the same gameplay mechanics as previous Call of Duty titles. The player assumes the role of a foot soldier who can wield various firearms (only two of which can be carried at once), throw grenades and other explosives, and use other equipment as weapons. A player close enough to an enemy can kill with one knife blow. A character can take three stances: standing, crouching or prone. Each affects rate of movement, accuracy, and stealth.

Massacre meets machismo in this third-person co-op survival shooter. Repel demonic hordes with firearms, melee and hand-to-hand moves in various solo and multiplayer modes over eight open maps plus an Inferno boss stage. And for a change of pace, why not play as a trap-setting, minion-spawning demon yourself ?

In Magicka, up to four players take on a grand adventure to save their world from certain doom using a fully dynamic spell system. The adventure mode takes the players across three different levels, ranging from the lush forests of mountain valleys to the frozen halls of the Mountain King where wits and creative thinking are the keys to victory.

Alien Swarm is a free game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes.

PAYDAY™ The Heist is an action filled first person shooter that lets players take on the role of a hardened career criminal executing intense, dynamic heists in constant pursuit of the next “big score”. Load out with an array of weaponry and equipment. Navigate six high-stake heists with three other live or A.I. Co-Op partners in crime.

Dead Space 2 is a survival horror third-person shooter. The player controls Isaac Clarke from a third-person point of view, looking over the character's right shoulder. The game features no HUD, relying on holograms projected from the player character and his weapons to show information such as messages and ammunition count, respectively. Player health and stasis are shown by visual indicators on Isaac's back. Isaac must fight an alien organism that infects and takes control of human corpses, turning them into "Necromorphs", mutating their bodies.