Koopa Beach is a beach, in Mario Hoops 3-on-3 and Mario Sports Mix. It is a playable court in the Mushroom Tourney and and the Mushroom Cup.
 Mario Hoops 3-on-3
Koopa Beach is a beach court in Mario Hoops 3-on-3 and the second court of the Mushroom Tourney. In the background there are two surfboards that have an M and L on them. There is also a pirate ship on the water in the background, that can sometimes shoot bombs in the field. If a player gets hit by it, he or she will fall down and lose the ball. Also, players move slower when playing in the surf on either side of the field. The course doesn't have an audience. There are no Koopas on the field, only a green shell design hanging over the court.
It is possible that Koopa Beach is a throwback to the Koopa Beach courses (such as Koopa Beach 2) of Super Mario Kart.
Peach Field can be seen in the background.
 Mario Sports Mix
The court returns in Mario Sports Mix now known as Koopa Troopa Beach. As in Mario Hoops 3-on-3, Koopa Troopa Beach takes place in a beach. All sports can be played in this court, a trait shared with many other courts. Birdos, Toads, and Piantas can be seen in the background of this court.
The main feature of this court is the constant waves, which brings either Green Shells or Coins to use for the players. There are also no features than can directly harm players in this stage.
A 2-on-2 Volleyball match.
A 3-on-3 Volleyball match.
A 3-on-3 Dodgeball match.
A beta screenshot of Hockey.