U Deluxe guide: Frosted Glacier Star Coins Every Star Coin location in Frosted Glacier By Kelly Hudson Sundberg Feb 18, 2019, 8:58am EST. Looking for the secret exits in New Super Mario Bros. U? We World 2: Layer Cake Desert. Spike's Spouting Sands. Right before the exit, you'll run past a tall green pipe (the last star coin is right below it) and a final red arrow. After you've accomplished this task, you'll unlock a new level in Peach's Castle: Firefall Cliffs. Sparkling Waters.