From the Super Mario Wiki
There is a person on a motorcycle driving through a field. The player must hold the button to do a wheelie, being careful not to raise the front wheel too high and fall over. The player must be in a wheelie to pass over the rocks that come by shortly after the microgame starts.
The player will fail the microgame if the scooter hits any rocks or tips over. Additionally, even if the player gets by all the rocks, they can still fail the microgame if the motorcycle tips over afterwards.
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