The closest matches on Steam are STAR WARS Republic Commando, Call of Duty 4: Modern Warfare (2007), Quake III Arena, Unreal Tournament: Game of the Year Edition and Half-Life: Opposing Force.
From the Steam games with at least 2,000 reviews and 80% or more positive, we keep the ones whose main player tags match Counter-Strike: Condition Zero's most closely, then show the closest first.
