Are you playing the or an older CD-ROM version ?
A trainer is a third-party software program that runs alongside your game. It modifies the game's memory values in real-time. A "+24" trainer specifically means the tool offers to alter gameplay mechanics. Core Features of a +24 Trainer counter strike condition zero trainer 24 link
Multi-option trainers (often labeled +18 to +24) for this game generally include the following features: Counter-Strike Condition Zero Cheat Codes | PDF - Scribd Are you playing the or an older CD-ROM version