From the Super Mario Wiki
The players are atop a mountain, and have to navigate their respective paddle wheels to the goal. The topmost team member begins first, and move the paddle wheel halfway before the other team member gets on, who must then move it to the goal. If any team member falls off at any point, they return in a bubble within two seconds. The first team to get the paddle wheel all the way to the end wins.
"Take turns pedaling the platforms! Jump with !"
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