Giant Skewer Tower
From the Super Mario Wiki
Giant Skewer Tower (Giant Spike Pillar Tower in the British English version) or Sparkling Waters-Tower, is the Tower course of Sparkling Waters in New Super Mario Bros. U. It is unlocked via Tropical Refresher, and completing the Tower unlocks Haunted Shipwreck, and a cutscene of Peach's Castle being completely shrouded in Magikoopa's tornado. However, the cutscene does not play if Freezing-Rain Tower is completed beforehand.
Similarly to World 4-Castle of New Super Mario Bros. Wii, this is a water course filled with Skewers. The first part of the Tower is underwater, and the most prominent obstacle are Skewers which thrust forward periodically. Dry Bones are the only enemies in the Tower.
Another Boom Boom is the boss of the tower. Magikoopa flies in and give him the ability to jump. Unlike in Stoneslide Tower, however, this Boom Boom keeps his spin attack, even after getting stomped on.
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