Koopa Beach is a beach-themed court in Mario Hoops 3-on-3, in which it is the second court of the Mushroom Tourney. Koopa Beach might be a throwback to Koopa Beach 1 and Koopa Beach 2 from Super Mario Kart.
In this court a pirate ship can be seen on the water in the background that can sometimes shoot bombs in the field. If a player gets hit by it, they fall down and lose the ball. Also, players move slower when playing in the surf on either side of the field. In the background, there are two surfboards that have an M and L on them, and the court does not have an audience. Despite its name, Koopa Beach does not feature any Koopas on the field, only a green shell design hanging above the court. Peach Field is also shown in the background.