Zombie stress is a Half Life 2 Single Player modification, which instead of giving you some complicated story or long winded puzzels to over come gives you what you want... zombies!
This patch fixes most issues related to engine branch incompatibility and is designed to run using the latest "Beta" of Source SDK Base 2013 Singleplayer...
The updated version of Zombie Stress with updated maps and more.
Zombie Stress is a Half Life 2 single player modification, which instead of giving you a complicated story, it gives you what you want... zombies!