Counter-Strike: Condition Zero (abbreviated CS: CZ or just CZ) is the newer version of the multiplayer game, Counter-Strike. The game was released in 2004 using the GoldSrc Half-Life engine. CS: CZ features a multiplayer mode, which mostly features updated character models, textures, maps and other graphical tweaks. Unlike other Counter-Strike games, Condition Zero also contains a single player mission pack with the player unlocking maps and more efficient bots as they pass certain requirements for each map while playing as a counter terrorist. These requirements include targets such as, "Kill 3 enemies with a glock" or "Win a round in 45 seconds." Condition Zero also contains bots with better AI than other Counter-Strike games.
As of 2008, the game is one of the ten most played Half-Life modifications in terms of players, according to GameSpy.
Several weapons from the "lost contents" have made an appearance in Deleted Scenes, including the M72 Light Anti-Armor Weapon, and the M60 machine gun. Some are limited to the AI terrorists, such as the machete and Rogue Entertainment's controversial suicide belt. Some reconnaissance weapons including the blowtorch, radio, Fiber optic Camera, and remote control bombs. Players can also carry up to three grenades instead of the usual one. Moreover, the power of players' Kevlar Armor is boosted, better protecting players from many projectiles and bullets.
Some weapons were completely reanimated. This includes the Colt M4A1, FAMAS and Galil with the exception of the SIG SG 552 which uses its "beta animations". Weapon textures are also slightly modified. The weapons are colored a bit differently from their Counter-Strike counterparts, such as the Arctic Warfare Magnum which is now brown instead of green, the Steyr AUG and the Colt M4 Carbine are now two-tone police black instead of the usual colors. It initially came with twelve missions, but later Steam updates added six additional missions that were cut from the initial release. There is a small community for Deleted Scenes, and a few custom maps have been released. Three are by Thearrel "Kiltron" McKinney, a mapper who worked on the game itself.