Counter-Strike: Condition Zero is a modern-military first-person shooter developed by Valve (in collaboration with Rogue, Gearbox, Ritual, and Turtle Rock) and published for the PC by Valve (on Steam) and Sierra (on retail) on March 23, 2004. An update to Half-Life: Counter-Strike, Counter-Strike: Condition Zero features updated graphics, new artificial intelligence, and two unique single-player campaigns (one based on the multiplayer game mode, known as Tour of Duty, and one completely separate expansion, known as Counter-Strike: Condition Zero - Deleted Scenes).
Deleted Scenes missions are single-player and the mission locations are worldwide from the cold Russian missile silo to the warm busy Japanese streets. In Deleted Scenes, players are prohibited from buying weapons like normal Counter-Strike gameplay; instead players collect weapons, ammo and armor along the way. Players always play as the Counter-Terrorist, while the enemies are AI bots. As opposed to the main campaign, Deleted Scenes missions usually put the player on their own and must find out how to proceed to the next level, unlike the multiplayer component of CZ where players have to eliminate all members of the opposing team or complete certain map objectives.