A Zombie Outbreak is an event won through a Mystery Card in which zombies will spawn randomly and infect other people to create more zombies. Tap on them to shoot them. A player can unlock Cars for killing a certain amount of zombies. Zombies will also appear when the time is 12:00 midnight on your device.
Zombie Cracker: Shoot 1000 zombies
Burning Ranger: Shoot 2000 zombies
Zombie Muscle: Shoot 5000 zombies