Super Mario Galaxy 2/Cosmic Cove Galaxy

Star 1: Twin Falls Hideaway
(using a shell underwater makes you go faster)

Star 2: Exploring the Cosmic Cavern
When you finish this level, a penguin will appear on Starship Mario.

Star 3 (hidden): Catch That Star Bunny
Enter Star 1, feed 15 coins to Hungry Luma.

Freeze the planet, shake the wand to ice skate.