Sherbet Land (world)

Sherbet Land, or Sherbet Island, is a secret world in the game Wario Land: Super Mario Land 3. It's completely optional and can only be reached by a secret exit in Mt. Teapot. Sherbert Land is a giant iceberg floating off the coast of Kitchen Island. Since it's an iceberg, its levels consist of lots of water and ice; several levels also have enemies such as D.D. and Pirate Goom frozen in blocks of ice. The boss of this world is the intimidating penguin Hinyari.

Course No. 16
The first block has a key. Then, the first door after that leads to a room that has the treasure door.