Mario and Luigi join forces with Paper Mario for a trio adventure! Luigi stumbles across a mysterious book and accidentally unleashes paper-thin versions of Princess Peach, Toad, and many others. Now he and Mario must team up with Paper Mario to help their paper friends get back to their own world! Triple action, triple fun! - Trio Moves: Work together to traverse great distances and smash huge obstacles! - Trio Attacks: Flatten enemies with three times the power! - Papercraft Battles: Fight for your life in battles with giant papercraft models! - Battle Cards: Battle cards help launch attacks and restore health during battle. - Character Cards: You can use amiibo to make special character cards with even stronger effects!