Mario & Luigi RPG - Paper Mario MIX (Japanese: マリオ&ルイージRPG ペーパーマリオMIX) is a crossover role-playing game developed by AlphaDream and published by Nintendo for the Nintendo 3DS. The game is a combination of the Mario & Luigi and Paper Mario series and features elements from both games. The game is set in the Mushroom Kingdom and follows Mario and Luigi as they team up with Paper Mario to defeat an evil force known as the Shadow Sirens. Players take control of Mario, Luigi and Paper Mario as they explore the kingdom, battle enemies, and complete puzzles. The game features an RPG-style battle system, where players can use a variety of attacks and special moves to defeat their opponents. The game also features a variety of minigames and collectibles to find. Mario & Luigi RPG - Paper Mario MIX is a fun and engaging game that is sure to please both fans of the Mario & Luigi and Paper Mario series.