From the Super Mario Wiki
Mario, Peach, Luigi, and Daisy in a doubles match in the Gooper Blooper Court.
Gooper Blooper Court is one of the tennis courts in Mario Power Tennis. It is set on top of the yellow platform in Ricco Harbor. Gooper Blooper is absent in this case. In the Gimmick Court, platforms on the court move, revealing water beneath them. Ordinary Bloopers watch these games. In the minigame Gooper Blooper Volley, the court is set where Gooper Blooper is fought the first time in Ricco Harbor and Gooper Blooper is present in this case.
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