SAS Zombie Assault 4

SAS: Zombie Assault 4 is an intense action-shooter with deep RPG elements, including upgradeable guns and armor, unique class skills, and class special abilities.

A virus outbreak on a distant trans-federation planet unleashes horrors from humanity's past. A powerful, rapidly-growing zombie horde threatens the very existence of humankind, and the only ones capable of fighting back are the highly-skilled, highly-weaponized special forces of the S A S. You can choose from 3 unique character classes, maximize the fully-customizable skill tree, and select from hundreds of weapons and armor pieces to build the ultimate zombie killing hero. You will play dynamic, challenging levels in single player or 4 player cooperative multiplayer, so you can give to the ravaged civilization its last best hope for survival.