Ghostly Galaxy

The Ghostly Galaxy is a galaxy in Super Mario Galaxy where Mario turns into a Boo with the new Boo Mushroom. Pink Boos, UFO spinning tops with Bob-ombs on them, Swoopers, Cosmic Scuttle Bugs, and Pumpkin Heads have been spotted in screenshots. Recent gameplay footage has shown Luigi in a jail cell and calling out for Mario in on a haunted house planet.

Enemies

 * Boos
 * Swoopers
 * Pumpkin Heads
 * Goombas
 * Bomb Boos
 * Chomp Heads
 * Cosmic Scuttle Bugs

Luigi and the Haunted Mansion
At first, Mario starts off on the Toad Brigade's ship, but has to use a Launch Star to reach the pathway into the mansion. Pumpkin Goombas litter the pathway, so Mario must be careful. Boos are inside the mansion, but a switch activates a swinging beam of light, which Mario has to lure them into to defeat them and get the items they are guarding. One of the Boos has a key to get deeper into the mansion.

Soon, there are Star Chips to collect to rebuild a Launch Star which will then be located in one of the windows a black hole was. using the Launch Star, Mario is then launched into another part of the mansion, where Luigi is calling for help, but the window makes it impossible to escape from. Mario will have to find another way inside, where he discovers a new power-up, the Boo Mushroom. As Boo Mario, he needs to vanish to pass through the bars, but must be careful as a beam of light is in the next area. A Boo falls in love with Mario somehow, so he'll have to get into the last room Luigi's in. Mario will need to return to normal before he can speak with Luigi and get the Power Star.

A Very Spooky Sprint
In this level, Mario must blast to the edge of the galaxy and race the Spooky Speedster, using paths of Pull Stars.

Beware of Bouldergeist
Mario is informed by a member of the Toad Brigade that Luigi has been kidnapped by "The monster that lives up ahead". Mario finds his way to a circular stone platform and then meets Bouldergeist, a ghost with the ability to control stone. Mario fights Bouldergeist with Bomb Boos and it eventually explodes, leaving behind a Power Star. Interestingly, the Toad at the beginning of the level said Bouldergeist kidnapped Luigi, although Luigi does not make an appearance in this level.

Bouldergeist's Daredevil Run
Very similiar to Beware of Bouldergeist (above) except that Mario starts on the boss planet and has a max. health of 1. This mission, until completed, is only available while a Daredevil Comet is in orbit.

Purple Coins in the Bone Pen
Mario starts off on a small planet with the "Bone Pen" in front of it. The Bone Pen features bones as walls, meaty bones as bumpers, spiky balls as obstacles, and Pull Stars for getting around. Thre are more than 100 Purple Coins, but 100 have to be collected before the Power Star appears in the centre of the pen. This mission, until completed, is only available when a Purple Comet is in orbit, and has a one minute time limit.

Matter Splatter Mansion
A mission similar to the Matter Splatter Galaxy. Platforms, and rooms only exist when a sort of "Spot Light" comes over them. The Player will need to go through, getting keys, and unlocking doors to get through, until, eventually, there will be a Power Star behind one of the doors.