Left 4 Dead is a co-operative multiplayer action game from Turtle Rock Studios, the creators of Counter-Strike. The game takes place in an apocalyptic world where a highly virulent strain of rabies has spread quickly through the human population, turning those infected into violent psychopaths. Players are among the few seemingly immune to this virus and must fight their way to safety or die alone alongside other Survivors. Left 4 Dead is built with version 2 of Turtle Rock's advanced A.I technology and runs on Source Engine for enhanced visuals and gameplay experience. In Left 4 Dead, players will have to work together if they want any chance at survival in this chaotic post-apocalyptic world.

Insurgency is an intense, multiplayer and cooperative Source Engine based video game. Players take to the streets for close quarters combat as they battle in teams to secure crucial strongholds and destroy enemy supply. It is a follow-up game to the award-winning Source mod that strikes a balance between one-life gameplay and prolonged action. The game is highly competitive with unforgivingly lethal consequences.