Zombie Panic Source Zombie Panic! Source (ZPS) is a cooperative survival horror Half-Life 2 Modification, the sequel to the popular Half-Life Modification "Zombie Panic". As a member of a party of survivors you find yourself without provisions or any military support. Fending off the undead has never been more difficult, but with a large variety of fire arms, explosives, and unique items, the task is not impossible. Release Date:December 2007Genre:Zombies, Multiplayer, FPSRating:MatureDeveloped By:Monochrome GamesPublisher:SteamSteam AppID:17500Engine:Source ZPS Latest Forum Threads Recent Topics ZPS 3.0 Custom Maps by CPT QuaG 3 years, 6 months ago zpd_abandoned_mall by Zombielle 4 years ago zpd_lakeofdeath by Zombielle 4 years, 1 month ago REDDIT TopicsZombie Panic! Source - v3.1 Update Available Now October 26, 2020Gingerbread ZPS_Harvest December 27, 2019Does anyone know the console command for voice lines? October 5, 2019v3.1 Beta Update 3 - Major Balance Changes June 1, 2019Dev Blog - Upcoming Major Balance Changes April 30, 2019 Latest Maps See All Maps zpo_madness_mall_b22 zps_lasertag_mmnb zpo_anoxia_b2 zps_nacht_der_untoten Latest Videos See All Videos ZPS “Deathmatch” CPT QuaG November 24, 2020 Night of the Evil Dead: Ultimate Edition Zombie Gaming November 11, 2020 Latest Gallery Images See All Images No items found.