Specifically designed maps like zm_zombie-apocalypse where teamwork is the only way to survive.

While standard CS 1.6 pits Terrorists against Counter-Terrorists in bomb defusal or hostage rescue, the (often part of the wider Zombie Mod or "ZM" family) shifts the focus to survival. In this mode, players must band together to fend off waves of infected or face off in intense "Zombie Plague" scenarios where one player starts as the "Nemesis" or "Origin Zombie". Key Features include:

Options to play as specialized humans (Survivors) or powerful zombies with distinct abilities. How to Download and Install

To get started with the best possible experience, follow these safe installation steps: A Beginners Guide to Counter-Strike 1.6 - Steam Community