From the Super Mario Wiki
Rammerhead Reef, or World Castle-6, is the sixth course in the seventh world of Super Mario 3D World, World Castle. It becomes accessible by beating Prince Bully Blockade Is Back, and its own completion unlocks Simmering Lava Lake and Captain Toad Gets Thwomped.
This level features Rammerheads, a rare fish in the shape of a hammerhead fish. The level begins with a lot of Rammerheads, then after the player will warp to a volcanic island with Madpoles where the Checkpoint Flag is located. The player needs to dodge more Rammerheads before they can reach the goal pole and complete the level.
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