Basement (Luigi's Mansion 3)

Basement
Floor	B1
Boss	Steward
Boo	Boosement

The Basement is an area in Luigi's Mansion 3. It is located below the Grand Lobby and above the Boilerworks. It contains a laundry room and parking garage, as well as Professor E. Gadd's lab. Luigi first explores this area near the start of the game, when he falls through the laundry chute after being chased by King Boo down the hallway of RIP Suites. He falls into the laundry room and is awoken by Polterpup, who leads him to the parking garage where he finds a red vehicle with the Poltergust G-00 inside. Polterpup then teaches Luigi how to use the vacuum, as well as the Strobulb and Burst. Luigi is then able to walk up to the first floor of The Last Resort.

Luigi returns to the basement later on after rescuing Professor E. Gadd. The professor sets up his portable laboratory and gives Luigi the Virtual Boo, allowing them to communicate at any time. He then sends Luigi on a mission to get his briefcase from the fifth floor. When Luigi returns with the briefcase, Professor E. Gadd opens it to reveal a capsule with a green goo-like substance which he injects into the Poltergust G-00. He then teaches Luigi how to use Gooigi. Luigi can return to Professor E. Gadd's lab at any time to play ScareScraper mode, view collected ghosts and gems in the vault, and talk to the professor.

Rooms

Image/Name	Gem availability	Boo availability
Laundry Room	Yes	Yes
Service Hallway	Yes	No
Garage	Yes	Yes
Service Stairwell	Yes	Yes
Lab	No	No
Elevator Shaft	Yes	No

Gem locations

Image	Location	How to Get
	Garage	After using the Poltergust G-00 to suck up the tarp off the hooded car, Luigi can flash the green light with the Strobulb to pop open the trunk, revealing the gem.
	Garage	Gooigi must walk through the chain-link fence at the far left, pop open the electrical box with the Suction Shot, then flash the green light to access the gem.
	Elevator Shaft	There is a metal cover on the far right of the Garage that Luigi can pull off with the Suction Shot to reveal a tunnel that leads into the Elevator Shaft. Luigi must climb the ladder to the top of the shaft, then have Gooigi drop down through the grate and get the gem.
	Laundry Room	Luigi can use the Suction Shot to pull the cover off the middle dryer, which contains the gem.
	Service Hallway	Using the Dark-Light Device on a painting near the garage door makes the gem come out.
	Service Stairwell	Gooigi must ooze through the bars on the floor at the top of the stairs to get to the gem.

Names in other languages

Language	Name	Meaning	Notes
Japanese	地下[?] Chika	Basement
Chinese (simplified)	停车场[?] Tíngchēchǎng	Parking area
Chinese (traditional)	停車場[?] Tíngchēchǎng	Parking area
Dutch	Kelder[?]	Basement
French	Sous-sol[?]	Basement
German	Keller[?]	Basement
Italian	Seminterrato[?]	Basement
Spanish	Sótano[?]	Basement