From the Super Mario Wiki
Shroomlock, Bowser and Koopa Kid in Bowser Mansion
in Mario Party Advance
The Bowser Mansion is one of the places in Mario Party Advance. It is located in the Town Area of Shroom City, but can only be accessed through the Pipe House.
When the player decides to stop here, they will meet Bowser and his cohort, Koopa Kid. Their quest, Bowser: Accused!, is a mystery, where Shroomlock has accused Bowser of stealing a valuable painting. The player must help Shroomlock find a flaw in Bowser's explanation that will prove he's guilty to solve the crime. After that, he'll challenge them to the Bowser minigame Mush Rush. If the player succeeds at defeating the set number of Koopa Kids, Bowser will reward them with the Gaddget, Lip Sync.
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