From the Super Mario Wiki
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Dream Sprint is a versus event involving competitors racing to get to the end of the stage in inflatable balls first. Speeding up will cause the ball to increase in size, and vice versa. A larger ball will be able to fit on double rails, accessing a shortcut.
In this event, players race Air Balls to get to the finish line in the fastest time.
Shake the Wii Remote when "Go!" appears on the screen for a Starting Dash!