In this new adventure, Prince Florian has invited Mario and his friends to the Flower Kingdom. Unfortunately a familiar foe drops in uninvited. Bowser and his minions crash the party and steal a Wonder Flower which merges Bowser with Prince Florian’s castle, transforming him into a floating fortress. As the power of the Wonder Flower quickly spreads across the kingdom, all kinds of weird and wonderful things start to happen. With the Castle Bowser now on the loose, players join Mario and friends on a new 2D side-scrolling adventure full of wonder to save the Flower Kingdom.