From underwater, the four players are seen on a dock above. They jump in the water and turn around, ready to swim.
The object of the mini-game is to swim through as many Bubble Rings as possible.
The game is seen from a rear view perspective. The Bubble Rings appear as the four players swim through the course. Each bubble ring is worth one point. Sometimes, a Manta Ray will swim by and drop three gold rings worth three points each. Hitting a Blooper will deduct one point, hitting Sushi will deduct two points, and hitting the orange eel at the end will deduct three points.
The players will swim through a goal at the end, and the scene changes to show them above the water. The winner will jump onto Toad's boat and do a winning pose. If more than one person wins, they will stay in the water and wave. If all players have the same exact number, however, Toad will instead drive away, leaving all four characters stranded in the water, resulting in a draw.
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