Mario & Luigi: Paper Jam — is an RPG that follows the same format as previous games in the Mario & Luigi series, with some additional elements from the Paper Mario series. The player simultaneously controls Mario, Luigi, and Paper Mario from their respective series and travels through the world of the Mushroom Kingdom to reach Bowser's Castle to rescue both variants of Princess Peach from both variants of Bowser from their respective universes. Each of the three uses different buttons to control them. In the overworld, the player can talk to non-player characters and solve puzzles, some of which must be solved in order to progress.