SAS: Zombie Assault 4 starts where the third installment ended.
It's the year 3104, and a virus outbreak in the trans-federation planet Thera is threatening mankind. Choose one of the 3 available classes, develop their skill tree and combine it with thousands of weapons and armor pieces in order to get rid of the zombies. Play your way through 7 challenging stages by yourself or in multiplayer mode, with up to 3 more users. Save what's left of our civilization!