From the Super Mario Wiki
Bullet Bill in the Mushroom Stadium
in Mario Party Advance
Mushroom Stadium is one of many locations in the game Mario Party Advance. It is located in the Desert Area of Shroom City.
When the player decides to stop here, they will meet Bullet Bill, the resident sprinter. His quest, A Speeding Bill, involves the player racing against Bullet Bill in a sprint. If he's defeated, he will reward them with the Gaddget Mini Soccer.
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