Counter-Strike (sometimes differentiated as Counter-Strike 1.6 and shortened to CS) is a tactical first person shooter video game developed by Valve Corporation which originated from a Half-Life Modification by Minh "Gooseman" Le and Jess "Cliffe" Cliffe. The game has been expanded into a series since its original release, which currently includes Counter-Strike: Condition Zero, Counter-Strike: Source, and Counter-Strike: Global Offensive. Counter-Strike pits a team of counter-terrorists against a team of terrorists in a series of rounds. Each round is won by either completing the mission objective or eliminating the opposing force.
With CS Steam Hack All Versions you can play CS online without Steam.