Dire, Dire Docks Village

Dire, Dire Docks Village is an area that can be found in the Fourth Floor of Princess Peach's Castle in a hidden room that is only accessible by Backwards Long Jumping. You also need the W Key and Donkey Kong unlocked in Bob-omb Battlefield. The level itself is a large underwater area with several destroyed houses. Upon entering a sunken ship, they can fight the Wario Apparition in a fight similar to the castle fight to unlock the Fifth Floor.