Sparkling Waters

Sparkling Waters is the tropical world in New Super Mario Bros. U. Players can reach it by moving south from the end of Layer Cake Desert, or via the secret exit in Soda Jungle. Sparkling Waters lies east of Acorn Plains, south-east from Layer-Cake Desert, south from Frosted Glacier, and west from Soda Jungle. Sparkling Waters is in an ocean filled with multiple islands and having bubbling water geysers, which is quite similar to World 4 from New Super Mario Bros Wii as that tropical world also had multiple islands. The world's name is possibly a reference to carbonated water. There are 7 levels in this world, consisting of 5 normal levels, the Fortress level and the Castle level. The boss of this world is Larry Koopa.

Levels

 * Sparkling Waters-1: Waterspout Beach: The first level of Sparkling Waters, it includes Huckit Crabs and water geysers.
 * Sparkling Waters-2: Tropical Refresher: The second level of Sparkling Waters.
 * Sparkling Waters-3: Above the Cheep Cheep Sea: The third level of Sparkling Waters, presumably a level with a large growing beanstalk.
 * Sparkling Waters-Tower: Giant Skewer Tower: The Tower level of Sparkling Waters.
 * Sparkling Waters-4: Urchin Shoals: The fourth level of Sparkling Waters include Urchins and water geysers.
 * Sparkling Waters-5: Dragoneel's Undersea Grotto: The fifth level of Sparkling Waters introduces the dragon-like eel Dragoneel, who follows and attempts to eat the closest player.
 * Sparkling Waters-Castle: Larry's Luminant Castle: The castle level of Sparkling Waters, containing fences to climb and Torpedo Teds.

Challenge Mode original courses

 * Bubble Up