Basement – E. Gadd Walkthrough
Welcome to our walkthrough for Luigi’s Mansion 3, the third entry in the series by Nintendo. We will show you how to find all gems, solve every puzzle, and defeat all boss ghosts. As always, everything is supported with plenty of images to make it easy to follow.
Intro
Once you arrive in the hotel lobby, take a moment to look around. You can talk to Mario, Peach, and the staff. To continue, check in at the reception.
You will then end up in Luigi’s room, where you can explore a bit. To proceed, open your suitcase on the bed.
During the night, you wake up after hearing Peach scream. Leave your room and head into the corridor. Go right to Mario’s Room 502. As you’ll notice, he’s not there, so continue to Peach’s Room 501.
She is gone as well. When you leave the room, the elevator opens. Approach it. After a short sequence, you will be chased by King Boo. Run away from him to the end of the corridor and jump into the shaft.
Basement B1 – Poltergust G-00
You land in the laundry room. Leave it through the door and take the first door you come across. This leads you to the parking garage.
Head right to the red car, where your dog reacts. Interact with it to find the Poltergust G-00.
- Gem 1 – Garage (white)
Pull off the cover and open the trunk using the Strobulb. - Gem 4 – Laundry Room (green)
Open the washing machine containing the gem.
- Gem 5 – Service Corridor (purple)
Reveal the gem on the special painting in the hallway.
Leave the garage and continue right to a door you can open with your flashlight.
Floor 1 – Reception
Go upstairs and head left to the reception. Defeat the ghosts here, then inspect the area more closely. Use a Suction Shot to get behind the desk and grab the gold key.
Turn on the lights and collect Gem 5 (purple) on Floor 1.
- Gem 4 (green) – Lobby
On the right side in front of the elevator, destroy the plant using the Suction Shot.
Floor 2
Go upstairs and pass through the large door. Follow your dog to the Professor’s painting, which you cannot help yet.
Continue left through the door. You won’t be able to follow your dog just yet—you need the next key. You can find it in the dressing room, the next door on the right.
Pay attention to the mirror in this room. On the right side (in the mirror), you will see a switch for your flashlight.
On the left side, you can open the safe using your flashlight and obtain Gem #4 on Floor 2. Activating the switch reveals a hidden compartment in the wall where you find the gold key.
Use it to open the previously locked door.
B1 Boss Fight – Steward
You will find a safe here. Open it with your flashlight to obtain the Dark-Light Device.
Return to the Professor’s painting and use the Dark-Light to free him.
You now need to escort him to the garage. Head back through the large door, then right to the elevator, and go down to B1.
Once there, return to the garage where a ghost appears.
Boss Fight: Steward
Avoid his attacks, then stun him with your flashlight and vacuum him. Repeat until he is defeated. You will receive the first elevator buttons.
Afterward, the professor sets up his mobile lab. Enter it and you will receive the Virtual Boo, a communication device.
He asks you to install the detector in the elevator, so interact with the elevator panel.
Heading to Floor 5
Now take the elevator up to the fifth floor.
Luigi's Mansion 3 guides