S.T.A.L.K.E.R.: Clear Sky - S.

Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.

Insurgency - Take to the streets for intense close quarters combat, where a team's survival depends upon securing crucial strongholds and destroying enemy supply in this multiplayer and cooperative Source Engine based experience.

Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.

Deus Ex: Invisible War - Deus Ex: Invisible War is an Action-Adventure, Role-playing, FPS (First-person Shooter), Science-Fiction, Stealth, Dystopian, Female Protagonist, and Single-player video game developed by Ion Storm and published by Square Enix.

Arma - Experience true combat gameplay in a massive military sandbox.