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Ranks are a game mechanic introduced in Mario & Luigi: Bowser's Inside Story, and later appears in Mario & Luigi: Dream Team, Mario & Luigi: Paper Jam and Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey. They are bestowed upon a character who reaches an appropriate level through leveling up. Each new rank confers benefits on the recipient.
List of Ranks
Mario & Luigi: Bowser's Inside Story / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
Ranks first appeared in Mario & Luigi: Bowser's Inside Story, giving set rewards to Mario, Luigi and Bowser when they reach a new rank. At the ending of the game, Chakron's voice appears, commenting on the player's progress and the current rank they had before beating the game; either suggesting the player tries harder next time or congratulating them on getting the highest ranks.
Ranks return in Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, with a few of the ranks from the original game being replaced and changing the order they are reached. Rank-Up Bonuses from the first two 3DS Mario & Luigi games also make an appearance, replacing the set rewards from the original game.
Mario & Luigi: Dream Team
Ranks work slightly differently in Mario & Luigi: Dream Team than in Mario & Luigi: Bowser's Inside Story. Instead of set rewards, such as extra gear slots or shopping privileges, the player can choose a Rank-Up Bonus to give to Mario or Luigi upon reaching a new rank. Upon reaching Rainbow Rank, the player can choose two Rank-up Bonuses, and can shop in the gold side of Rose Broquet. This means that each Bro. has a maximum of five bonuses once the player reaches Level 40.
Mario & Luigi: Paper Jam
Ranks in Mario & Luigi: Paper Jam work similar to the one in Mario & Luigi: Dream Team, but there are seven ranks for every character. Once again, for Rainbow Rank the player can choose two Rank-up Bonuses, which gives the player the limit of seven slots for bonuses per character after having reached the final rank.