Blackout

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Lightning striking the mansion.

The blackout is an event in Luigi's Mansion. After Luigi defeats Boolossus and opens the door to Area 4, several bolts of lightning strike the mansion. This causes the power to go out, darkening every room, including ones Luigi has already completed, and allowing ghosts to wander freely.

During the blackout, set groups of ghosts appear in rooms, even replacing ones Luigi has not caught, including Portrait Ghosts. This can make the mansion difficult to navigate. Gold Mice reappear in the darkened rooms if Luigi had not captured them before, so the blackout can be used to his advantage. Ghosts in a room respawn if Luigi captures all of them and reenters the room during the blackout. The only rooms without ghosts are the Foyer, the Bottom of the Well and the Breaker Room, though they still go dark. Also, some previously accessible rooms lock up during the blackout. They reopen after Luigi turns the lights back on. The player cannot save during the blackout as none of the Toads appear and no Boos can be caught.

In order to turn the power back on, Luigi must find and capture Uncle Grimmly in the Wardrobe Room, causing a chest containing the key to the Breaker Room to appear. He can get a hint about this by talking to Professor E. Gadd in the Telephone Room. Luigi can use the key to enter the Breaker Room and pull a switch that restores the mansion. Rooms that Luigi had not previously completed stay dark except the Breaker Room, which lights up.

Until the blackout situation is resolved and Uncle Grimmly captured, Luigi cannot go back to the lab via the Mansion's entrance in the 3DS remake of the game as the door is locked by a "mysterious force".

Ghosts

It has been requested that this article be rewritten. Reason: Disregards several smaller ghosts, such as Blue Mice, as well as the halls, which also are fairly consistently-occupied during the blackout. (tagged on September 9, 2017)

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Luigi on the Balcony during the blackout.

Luigi talking to Professor E. Gadd.

This list shows the different ghosts that appear during the blackout and the rooms in which they are found.

Room	Ghosts
Telephone Room	1 Gold Ghost 1 Purple Puncher 1 Blue Twirler
3F Left Hallway	1 Bowling Ghost
Balcony (3F)	2 Gold Ghosts 2 Purple Punchers 2 Blue Twirlers
3F Right Hallway	1 Bowling Ghost
Safari Room	2 Gold Ghosts 2 White Grabbing Ghosts
2F Hallway	Purple Bats Sparks Gold Bats Ceiling Surprises Bowling Ghosts Purple Bombers Blue Mice Purple Mice
Astral Hall	6 Ghost Guys
Washroom (2F)	2 Temper Terrors
Bathroom (2F)	2 Blue Twirlers
Nana's Room	5 Purple Punchers
Tea Room	1 Blue Blaze
2F Staircase	3 Gold Bats
Rec Room	2 White Grabbing Ghosts 3 Blue Twirlers
Courtyard	Flying Fish
Bottom of the Well
1F Hallway	Purple Bats Ceiling Surprise Purple Bombers Blue Mice Purple Mice Gold Bats
Bathroom (1F)	3 Temper Terrors
Washroom (1F)	1 Red Grabbing Ghost
Billiards Room	3 Gold Ghosts 3 White Grabbing Ghosts
Projection Room	7 Cinema Ghosts
Conservatory	3 Gold Ghosts 1 Purple Puncher 1 Speedy Spirit
Ball Room	5 Ghost Guys
Storage Room	2 Purple Punchers 2 White Grabbing Ghosts
Dining Room	1 Gold Ghost 2 Garbage Can Ghosts
Kitchen	1 Gold Ghost 2 Purple Punchers
Boneyard	3 Temper Terrors
Graveyard	N/A
Fortune-Teller's Room	2 Purple Punchers 1 Blue Twirler
Mirror Room	6 Mirror Ghosts
Laundry Room	3 Garbage Can Ghosts
Butler's Room	2 Gold Ghosts 2 Flashes Blue Mice
Hidden Room	1 White Grabbing Ghost 2 Blue Twirlers Gold Bats 1 Speedy Spirit
Foyer	N/A
2F Family Hallway	Blue Mice Purple Mice Ceiling Surprise Purple Bomber
Study	1 Red Grabbing Ghost
Master Bedroom	2 Gold Ghosts 3 Red Grabbing Ghosts
Nursery	2 Gold Ghosts 1 Purple Puncher 1 Blue Twirler 1 Speedy Spirit
The Twins' Room	2 Ghost Guys 2 White Grabbing Ghosts
Parlor	5 Gold Ghosts
Anteroom	4 Gold Ghosts 1 Purple Puncher
Wardrobe Room	Uncle Grimmly
Balcony (2F)	2 Gold Ghosts
Basement Staircase	N/A
Breaker Room	Blue Mice