The world of Paper Mario is invading the Mushroom Kingdom! Become the superstar team of Mario, Luigi, and Paper Mario to take on quests and take down enemies. Untangle these two classic universes in this hare-brained new entry in the Mario and Luigi RPG series. When Luigi accidentally opens a mysterious book hidden away in Peach's Castle, he gets more than he bargained for when characters from the Paper Mario universe spill out of the pages and start running amok. Players must take control of the terrific trio of Mario, Luigi and Paper Mario to defeat Bowser and Paper Bowser and bring the Paper Mario characters back to their original world.