A Mighty Melee
From the Super Mario Wiki
A Mighty Melee is a post-game level in the Bowser Jr.'s Journey mode of Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
This level features battles against King Bob-omb and Broque Madame, each with their respective gimmicks. In the first round, King Bob-omb must be defeated in under 60 seconds. In the second round, Broque Madame must be defeated before four allies get slain. In the third round, King Bob-omb must be defeated in under 90 seconds.