Counter Strike Source
Counter-Strike: Source (officially abbreviated CSS) is an FPS video game developed by Valve Corporation. It is a complete remake of Counter-Strike using the Source game engine. As in the original, Counter-Strike: Source pits a team of counter-terrorists against a team of terrorists in a series of rounds. Each round is won either by completing an objective (such as detonating a bomb or rescuing hostages) or by eliminating all members of the opposing team.
Please note, you have to have a legitmate steam copy of Counter Stike: Source to play on this server.