From the Super Mario Wiki
Spinning-Star Sky, or Frosted Glacier-1, is the first course of Frosted Glacier. It is unlocked via completion of Morton's Compactor Castle, and its own completion unlocks Cooligan Fields and a spot with a Bubble Baby Yoshi.
This course is a snow-themed level, with many Munchers, Goombas, Koopa Troopas, and star-shaped platforms that spin as the player steps on them. In the background of this level are ice mountains, pine trees and a starlit blue night sky full of constellations. This level also contains many hidden areas that usually contain coins, including one with a Super Star, which the player can use to run across the Munchers ahead.
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