Mario & Luigi: Dream Team - Sidequests

As with the previous entries in the series, there are a myriad of sidequests that Mario and Luigi can find and complete throughout the game. Some of the sidequests are traditional ones, while others are sort of like mini-games. There's also an achievement-like system called Expert Challenges, which are optional objectives that can be achieved in battles., as well as two "collectibles" in the game.