The Mario Bros aren"t the only brothers in town. There are also another set of brothers called the Zombie Bros. Unlike the Mario Bros. the Zombie Bros. like mushrooms and are on a mission to collect as many as they can. You need to help the Zombie Bros make their way through the forest to collect as many mushrooms as they can. Its not as easy as just collecting the mushrooms. You have to watch out for traps and other obstacles. Also there are different types of zombies that eat different kinds of mushrooms so make sure you are going after the right kind.