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Bowser Jr. Breakdown is a Mid-boss Battle mini-game. It is the only Boss mini-game that can appear on the Bowser Station board, along with Bowser's Block Battle.
The intro cutscene involves Bowser Jr. attaching his Junior Clown Car to a much bigger and more intimidating model of the Clown Car. The four players are tasked with jumping up to hit the dice block. Whatever number appears on the block will determine how many yellow lights will go into the meter above the screen. If the meter stops on a star, then the player who landed on it will get a chance to attack Bowser Jr. and get however many points are shown on the star. However, should the player land on a Bowser Jr. Space, then Bowser Jr. will attack the player and their points will be deducted. Players will continue to do this until Bowser Jr.'s health bar goes down. When Bowser Jr.'s health bar is down to 50%, he will grow angry and create more Bowser Jr. Spaces on the meter, giving him more chances to attack. Once Bowser Jr. has been defeated, whoever has the most points by the end of the boss battle is claimed the winner.