Mario & Luigi: Paper Jam is a crossover role-playing game for the Nintendo 3DS, combining elements from both the Mario & Luigi and the Paper Mario series. Released in 2015, the game blends the 3D world of Mario & Luigi with the paper-thin characters from Paper Mario, creating a unique gameplay experience. Players control both the classic and paper versions of Mario characters as they embark on an adventure to restore both of their worlds after an accident causes the universes to collide. The game is known for its humor, puzzle-solving, and turn-based battle system.