Sherbet Land

Sherbet Land is a huge glacier in the game Wario Land: Super Mario Land 3. It's completely optional and can only be reached by a secret exit on Mt. Teapot. The boss is a penguin who can be skipped because of an exit door in the same room.

It has also recently appeared in Mario Hoops 3 on 3 as a playable court in the Rainbow Tourney.

Mario Hoops 3 on 3
Sherbet Land is the first court played on in the Rainbow Tourney. The entire court is frozen, giving very little traction. Players will slip and fall if they attempt to steal the ball while running. An item exclusive to this court is the Freezie. When picked up and thrown, the Freezie will slide along the court until it either hits a player or bounces off two walls. If a player is hit he or she will be frozen in a pillar of ice for several seconds. If no one is hit before the Freezie hits two walls, it will simply shatter.