Counter-Strike: Condition Zero
GoldSrc
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Supported OS: 
Windows • 
macOS • 
Linux + 
SteamOS (See system requirements)
Chromebook ready: 
Unknown / TBD
Steam Deck status: 
Playable - 
More info on ProtonDB
Note:If you are experiencing compatibility and stability issues with this game after 
Counter-Strike: Condition Zero was updated to support 
Half-Life 25th anniversary update, please downgrade the game by selecting the steam_legacy branch on both Half-Life and Counter-Strike: Condition Zero. You can also report bugs and other issues here on GitHub. Click here for more info. Buying this game will also grant access to 
Counter-Strike and 
Condition Zero Deleted Scenes.
Counter-Strike: Condition Zero is an offering of single and multiplayer content with its Tour of Duty campaign, a large number of skirmish modes, updates, and new content for Counter-Strike's award-winning multiplayer gameplay, plus over 12 bonus single-player missions.
Official Condition Zero versions of the official Counter-Strike maps use the prefixes "de" (Bomb Defusal) and "cs" (Hostage Rescue) with the suffix "cz" at the end (example: "de_dust2_cz"). All maps installed in the Counter-Strike 1.6 directory can be accessed from Condition Zero as well.
Condition Zero's primary claim to fame is the included bots, which can be used to simulate multiplayer matches or to increase the number of players in a real multiplayer match. The bots feature excellent AI and have numerous configuration options to provide a better playing experience.
Condition Zero was originally developed by Rogue Software who were forced to scrap the project after internal problems resulting in Rogue's closure. Following Rogue's attempt, 
Gearbox Software was tasked with the job of creating Condition Zero. Gearbox's version was widely publicized, however, after many delays, Valve eventually passed the job onto Ritual Software. Ritual Software's attempt was eventually scrapped, however, their work was modified and released as Condition Zero Deleted Scenes. Condition Zero was finally completed by 
Turtle Rock Studios and 
Valve Software.
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