Layer-Cake Desert

Layer Cake Desert is the desert world in New Super Mario Bros. U, lying directly north of Acorn Plains, north-west of Sparkling Waters and Soda Jungle and south-west from Frosted Glacier. As with previous World 2's in the series, it takes place in a desert, but unlike the previous desert worlds, it has various desserts within the world, such as giant cakes (with one giant cake in the world map) and giant melting ice cream cones. This is likely a pun on the similarity of the words "desert" and "dessert". The boss of this world is Morton Koopa Jr., who was also the boss of Desert Hill in Super Mario Bros. 3. There are also giant Moai statues in a sea of sand, which also appear in some levels and in the world map. A Super Acorn can also be found in the map alongside the Enemy Courses, where it'll possibly give Mario a Super Acorn in his inventory. At the end of Layer Cake Desert, there's a fork in the road that leads to Frosted Glacier or Sparkling Waters.

Levels

 * Stone-Eye Zone: The first level of Layer Cake Desert. A desert level with Moai Heads and large cakes in the background.
 * Perilous Pokey Cave: The second level of Layer Cake Desert, and it is a level with Pokeys and shifting sand.
 * Fire Snake Cavern: The third level of Layer Cake Desert. It is an underground desert level with Fire Bros. and Fire Snakes. It introduces Bulb Baby Yoshis.
 * Layer Cake Fortress: The fortress level of Layer Cake Desert.
 * Spike’s Spouting Sand
 * Layer Cake Desert 5
 * Blooming Lakitu’s
 * Morton’s Compactor Castle

Trivia

 * Every world (counting this one) in New Super Mario Bros. U that is confirmed and is showed, has a pipe at the beginning of the world.