If Mario is careful and does not retrace his steps, he will obtain all of the Purple Coins, and then a Power Star will appear. This is no easy feat however, due to there being a large number of Cosmic Clones trying to stop Mario. Mario starts the mission by entering the pipe leading to the Shadow Vault, where there are 100 Purple Coins that need to be collected.

This mission is only accessible, until completed, when a Purple Comet is in orbit.

Defeating them will grant Mario a Power Star. After he has done this, he can finally reach the Puzzling Picture Block, and when he solves the puzzle there, he will be confronted by the Mandibug Stack. The saws will cut off parts of the planet, so Mario must go as fast as possible in order to stay on the platforms. He can then find a Launch Star to go to the Pound Pillars Planet, where he must solve a puzzle to move on to the Wood Road Planet. The Puzzling Picture Block starts out by placing you on the Starting Planets, where Mario must Ground Pound the middle of the planet to move into the area below. This is the only main mission of this galaxy.

2.7 Wood Island Planets/Bugaboom's Wooden Planet.

Super mario galaxy ost area complete