From the Super Mario Wiki
Stone-Eye Zone, or Layer-Cake Desert-1, is the first course of Layer-Cake Desert in New Super Mario Bros. U. It features several Stone-Eyes and Sand Geysers, and various ice cream cones and a large cake are visible in the background. It is also the last course in Easy Pack.
Completing this course unlocks Perilous Pokey Cave and Fire Snake Cavern as well as a red Toad House. In addition, it also triggers the first instance of Nabbit and unlocks the Pipe Cannons used to get from world to world.
The course's main gimmick is the Stone-Eyes, which move in various direction (side to side, up and down, etc.) and sink into the sand/ground when Ground Pounded. Various palm trees can be used to reach higher places. Quicksand also exists to hinder the player and stop progress.
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