Mario & Luigi: Partners in Time is an RPG released in 2005 for the Nintendo DS. Developed by AlphaDream, it's the second title in the Mario & Luigi series, following Mario & Luigi: Superstar Saga. The game combines turn-based battles with timing-based actions and sees Mario and Luigi team up with their younger selves to defeat aliens known as the Shroobs who have invaded the Mushroom Kingdom. As players navigate through various timelines, they solve puzzles and engage in battles that require coordination between the Bros.