:Cannon artillery was playing in the mountain, accidentally fell into a cave. And there are three crystal balls in the cave, so he just want to take them home to his younger sister. But when he went to get the crystal balls, suddenly a zombie carrying gun appeared in front of him, and fired at him. The crystal ball is guarded by the zombies, and zombies are full of the whole cave, there are a variety of the king of zombies guard them. Help cannon artillery destroy all the zombies and bring down the crystal balls so as to gather up them.