Bloocheep Sea is a court in Mario Hoops 3-on-3. It is the second court in the Rainbow Tourney bracket and is based on the underwater levels from Super Mario Bros., complete with 8-bit Bloopers swimming around the court. If the ball hits one of these Bloopers, it will fly off at an angle relevant to how it hit the Blooper. Because the court is underwater, all of the characters' movements are slowed. Its name also appears to be a mixture of Blooper and Cheep-Cheep.
A Sushi appears in the background swimming back and forth. An item exclusive here is Mimic.
Also, in Harmony Hustle, a minigame from Mario Sports Mix, level 2 contains a piece of music, classified as "Bloocheep Ocean". Despite different names, the music on the basketball court is the same as the music in the minigame.