From the Super Mario Wiki
Mushroom Stadium is a location in Mario Party Advance. It is located in the Desert Area of Shroom City. It has a red dome on the outside covering a set of stands and a pair of straight track and field lanes. It is the training ground for distinguished racer Bullet Bill and the site for his quest, A Speeding Bill. His quest involves racing him from one end of the stadium to the other side. Mushroom Stadium must also be visited for the Kamek Krew's quest, Kamek Krew Live!, which involves the player looking for a location that they can perform. Bullet Bill lets the Kamek Krew play at the stadium since he is a big fan of theirs.
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