SAS: Zombie Assault 4

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Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing. SYSTEM REQUIREMENTS MINIMUM: OS: Windows 7 (32 & 64bit) Processor: 2GHz or better Memory: 1024 MB RAM Graphics: OpenGL 2.0 compatible, ATI, Nvidia or Intel HD Storage: 512 MB available space Sound Card: Windows compatible sound card https://store.steampowered.com/app/678800/SAS_Zombie_Assault_4/