Mario and his friends are invited to join another party in the sky. When Mario arrive to the floating islands in the sky he found Toadswroth and Toad Brigade, the hosts of this party adventure. Suddently appears Bowser and he built his own party, Bowser's Fortress. A whole fortress with a total of 10 bosses and 50 minigame challanges. Donkey Kong and Flutter appears too, they make an entire extras collection with exclusive new 3D levels.