Counter-Strike (sometimes differentiated as Counter-Strike 1.6 or shortened to CS) is a tactical first-person shooter video game developed by Valve Corporation which originated from a Half-Life modification by Gooseman and Jess 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. The game was the most played Half-Life modification in terms of players, according to GameSpy in 2008. As of August 2011, the Counter-Strike franchise (Valve) has sold over 27 million units. Counter-Strike is a first-person shooter in which players join either the terrorist team, the counter-terrorist team, or become spectators. Each team attempts to complete their mission objective and/or eliminate the opposing team. Each round starts with the two teams spawning simultaneously. A player can choose to play as one of eight different default character models (four
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