Dire Dire Docks is the 3rd fortress level in the Mushroom Kingdom. It is based off the Super Mario 64 level of the same name. The level begins with the player swimming down into the fortress past a maze of blocks while evading sea life and path-blocking Urchins. Once inside, they must navigate along the dungeon while avoiding its spiky floor and various obstacles, made more difficult by the tide inside constantly rising and falling. After negotiating that, a key must be retrieved from the top of a tall chamber and taken to the bottom to get another key to move on to the boss, Wendy O. Koopa.