zombies have invaded cities. The whole world is under the invasion of zombies. You need to kill the incoming zombies. Don't be late to kill. Save the cities from invasion and pass the levels and finish the game. pixel zombies, zombie game, arcade game, zombie survival, action game, zombie apocalypse, mobile game, free to play, zombie shooter, level based game, undead, apocalypse, save the world, zombie defense, action, gameplay