Luigi and the Haunted Mansion

Luigi and the Haunted Mansion is a level in Ghostly Galaxy from Super Mario Galaxy. The primary goal of this mission is to rescue Luigi from being trapped in a haunted mansion. Once this level is cleared, Luigi sends Mario letters with him finding Power Stars.

Layout
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. Jack O' 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, Star Chips can be collected to rebuild a Launch Star which will then be located in one of the windows where a black hole was before. Using the Launch Star, Mario is then launched into another part of the mansion, where Luigi is calling for help beyond an impassable window. 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 he must be careful as a beam of light which will make him lose the Boo Suit is in the next area. Mario needs to return to normal before he can talk to Luigi to get the Power Star, for if Luigi is approached in Boo form, Luigi will hide his face in fear.

Enemies

 * Boos
 * Chomp
 * Goombas
 * Jack O' Goombas
 * Scuttlebug

Trivia

 * The level is an allusion to Luigi's Mansion, since Bouldergeist captured Luigi and Mario has to rescue him, taking place in a haunted setting with a mansion, although the roles of Mario and Luigi have now been inverted.