Play Counter-Strike: Source

Play Counter-Strike, a popular first-person shooter game known for its competitive gameplay and team-based strategy.

Play Counter-Strike 2, a popular first-person shooter game

The version that made the game an esport and the skin economy that came with it.

The retail release with a bot ladder and Deleted Scenes, a single-player campaign cut from another studio’s version.

Nine classes, hats and the Heavy; Valve's cartoon shooter, free since 2011.

Valve remake the Quake mod on the Half-Life engine in 1999, nine classes and concrete bases intact.

Climb the tier ladder past the bots to Xaero, then stay for the rocket jumps and rail shots.

Quake III rebuilt to run in a browser, then moved to Steam; the arena game kept alive for a decade.