Deep Dark Galaxy

Deep Dark Galaxy is a ghost-type galaxy in Super Mario Galaxy, like the Boo's Boneyard Galaxy and the Ghostly Galaxy. However, the main planet in it has a beach with many Toads and crab-like enemies. There are also Magikoopas near it. The thing that makes it "spooky" is that there is an underwater cavern (it's rather dark, giving the Galaxy its name) filled with "ghost ships". There are very few planets aside from the big, main one. This is also the second appearance of Guppy.

The Underground Ghost Ship
Mario begins on an island of some sort with the Toad Brigade already exploring it(They are on a "vacation" although they claim they are searching for Power Stars). The player must jump into the cannon on the center of the island. The player must make sure to point the cursor at the Starman which will give Mario invincibility. When Mario lands on the planey, he needs a Fire Flower to become Fire Mario and he should use the launch star to go back to the island. The player should light both urns in one try. Once Mario opened the gate, he must travel into the cave and he must dive into the body of water in front of him. Mario must dive into the water and the player will find a lever. Mario should do a Star Spin to open the gate. The player must swim to the surface. Mario will find a ghost ship surrounded by Boos. The player should go on the ghost ship to fight Kamella. Once Mario defeated Kamella, the player gets a Power Star.

Bubble Blastoff
Mario most defeat a Mole Cannon by star spinning coconuts into him. Then, you must go into the cannon to blast-off to a metal base far at the side. However, you must time it correctly, to hit the wall, or Mario will blast off into space. After blasting off to the base, you will go through it, and use a Launch Star to a transperent planet that has a melon and tennis balls inside it. Mario most ground pound the tennis balls into the melon 5 times to make it explode, and reveal a Power Star that was inside it. However, shocking force fields are generated to make this task hard.

Guppy and the Underground Lake
Grab a shell and get to Guppy in the lake. Once again, you must go through his eight rings to get the star.

Ghost Ship Daredevil Run
Mario starts off in the scene where he lands in front of the ghost ship that is surrounded by Boos. The player will have to go on the ghost ship to fight Kamella. Every now and then Kamella throws a green shell at Mario, which he must use to attack her. The best way to defeat Kamella is to take out the Magikoopas and then wait for her to throw a shell at Mario. Once Kamella is defeated, the player gets a Power Star.

Plunder the Purple Coins
The level immedeatlly starts at the Underground Ghost Ship, however Kamella is not here. Once you collect all 100 coins variously spread out, you will get a Power Star. Unlike some Purple Comet levels, your not timed.