From underwater, the four players are seen on a dock above. They jump in the water and turn around, ready to swim. Realistic crabs are seen holding flags at the starting point.
The object of the minigame is to swim through as many rings as possible. The game is seen from a rearview perspective. The rings appear as the four players swim through the course. Each ring is worth one point. Sometimes, a Manta will swim by and drop two or 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. Any player with the most points wins. However, if all players have the same number of points, the minigame ends in a draw.
The players swim through a goal at the end, and the scene changes to show them above the water. The losers stay in the water while the winner jumps onto Toad's boat and does a winning pose. If more than one player wins, they will stay in the water and wave. If a draw occurs, Toad will instead drive away, leaving all four players stranded in the water.
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