SAS: Zombie Assault 3

Game description: 

World is captured be terrible monsters! They are everywhere, and to cope with them you have to show all that you can do. Take your position and try to repel the attack of bloodthirsty zombies. After each mission you'll get a reward and you can improve your weapons and buy the required amount of bullets. To survive as long as possible do not forget to repair the broken fence, it will help you to stop a large number of monsters for some time. Good luck!