During each level, you must kill waves of zombies. You can create boxes to stand on (Zombies can’t jump remember) and choose different weapons to kill them. Each weapon has a timer and is only active for a certain amount of seconds. You can also use rage boosts to increase your DPS and fire-rate. As you progress, you can upgrade your skills and unlock new weapons. Can you fight off the zombie invasion? Will you help Pedro and Juana survive?