Purple Coins in the Bone Pen

Purple Coins in the Bone Pen is the fifth level in Ghostly Galaxy from Super Mario Galaxy. It is available only when a Purple Comet is in orbit.

Layout
Mario starts off on a small planet with the modified Boo Race Zone in front of it. The Boo Race Zone in this level features bones as walls, meaty bones as bumpers, spiky balls as obstacles, and Pull Stars for getting around. There are more than 100 Purple Coins, but only 100 have to be collected by the player before the Power Star appears in the center of the pen. This mission has a one minute time limit, the strictest time limit of all Purple Comets in the game. The time still goes on even after 100 coins is collected. There are a total of 149 coins in the Boo Race Zone itself, while the small starting planet has one coin on its backside, with a total of 150.