Counter-Strike all game works in one place

Counter-Strike (full name: Half-Life: Counter-Strike) is a multi-player first person shooter game series officially released by Valve Software in 1999, whose founders are Minh Le (AKA: Gooseman) and Jess Cliffe. It was originally just a game module for Half-Life, and finally became an independent game after being acquired by the developer of Half-Life - Valve. Its game development engine is from the original GoldSrc engine to now Source engine.