Counter-Strike: Condition Zero is a multiplayer video game, the follow-up to Counter-Strike. The game was released in 2004 using the GoldSrc engine. Condition Zero features a multiplayer mode, which features updated character models, textures, maps and other graphical tweaks. It also includes two single-player campaigns, including Condition Zero: Deleted Scenes.
Condition Zero started development in 2000 by Rogue Entertainment, and was initially announced in May 2001 at E3 of that year. Rogue's producer for the game, Jim Molinet, later that year moved to Sony and the development company went defunct, leaving Valve empty. Later, they gave it to Gearbox Software, the developers of the Half-Life expansion packs, so that Valve could focus on the development rival Team Fortress 2 and its new engine.