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Zombie Panic! Source - Mods & Resources by the ZPS Modding Community.

Zombie Panic! Source Banner

This mod was among the first of mods to be released for download over Steam and has been distributed over Steam ever since. The basic idea of Zombie Panic! Source is to create solid game play that is based on a classic zombie outbreak scenario. The living dead are coming for the last remaining humans, and these survivors must fight them off and live through the day.