Counter-Strike (commonly abbreviated to CS) is a tactical first-person shooter video game which originated from a Half-Life modification by Minh "Gooseman" Le and Jess "Cliffe" Cliffe, and features real-world weapons. The game has been expanded into a series since its original release, which currently includes Counter-Strike: Condition Zero, Counter-Strike: Source, Counter-Strike: Anthology and Counter-Strike on Xbox.

Counter-Strike pits a team of counter-terrorists against a team of terrorists in a series of rounds. Each round is won by completing either the mission objective or eliminating the opposing force. The latest incarnation of the game, Counter-Strike: Source, is based on the Source engine developed for Half-Life

Signs of Counter-Strike's wide influence can be found in mods for games such as Quake III Arena, Unreal Tournament, and other standalone shooters such as Global Operations, America's Army, Call of Duty, True Combat Elite and many more.

Online/Lan: Yes/Yes
Bots: Yes
Q: What was taken?
A: Only a few sounds and maps