Given the game’s low system requirements (a Pentium III processor and 96MB of RAM were often sufficient), it was an ideal candidate. These portable versions were typically stripped-down builds, sometimes compressing the full game into a file size as small as 1.2GB or even 64.6Mb for heavily reduced variants, making them easy to hide on a student’s MP3 player or USB stick.

Valve Corporation never released an official "Portable" edition of Counter-Strike: Condition Zero .

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