Super Mario Galaxy 2/Clockwork Ruins Galaxy

Star 1: Time for Adventure
This stage features Mario running over a series of cogs and wheels to get the star.

Star 2 (Prankster Comet): The Adventure of the Purple Coins
Get all 100 Purple Coins in a time limit of 5 minutes. The course is one section of Star 1.

Star 3 (hidden): The Ledge Hammer Trap
Enter Star 1. Collect and then proceed to feed 30 coins to the Hungry Luma on the first section. This sends Mario to a planet with multiple large hammers and some moving platforms. These large hammers will instantly crush Mario and cause him to lose a life, so they should be carefully avoided. Multiple blue switches can be found along the path to slow down time, helping to navigate through the small planet. While there are several 1-Ups along the way, they are in precarious locations that often will lead to Mario losing a life if not careful. It is advised to ignore these green 'shrooms and to focus on getting the Power Star at the end of the hammer-filled path. While possible to use a backflip and wall jump combination to skip the challenge entirely, it is extremely difficult to perform: Completing the stage as intended is best.