The Bowie Knife allows to you take down higher level zombies in one quick blow.New Teleporters allow you and your team to zip around this enormous map and evade the oncoming Zombie Horde.The all-new Pack A Punch Machine allows you to upgrade ANY of your weapons: Increased Firepower, More Ammo, and a new Metal Finish.This is the ultimate Co-op experience for the iPhone/iPod Touch! Now includes the ALL-NEW fan favorite, Der Riese, the largest, most feature-rich Zombie map to date.