Key

Key
Worth	Special
First time found	Unknown (LM) Garage (LM2)1F - Grand Lobby (LM3)

Keys are special items found by Luigi in the Luigi's Mansion (Series). They help Luigi unlock doors that lead to new areas. Luigi can obtain a key by lighting up a room or doing something specific (for example: the key leading to the Butler's Room is obtained by lighting up all candles in the Fortune-Teller's Room while it's still dark).

Key icon as it appears on the Game Boy Color's map, in Luigi's Mansion for Gamecube.

Cutscene of Luigi using a normal key, in Luigi's Mansion for Gamecube.

Special Keys are obtained via many ways. They can be from defeating a ghost to finding them in a chest. Some keys are special and there are only one of in the game. They're listed below:

Special Keys in Luigi's Mansion

• Key to Area 2, the Heart Key (obtained by Chauncey): The door that leads Luigi to Area 2 is the main one of the lower part of the Foyer. Also, the door has a pink heart shape on it.
• Key to Area 3, the Club Key (obtained by Bogmire): The door that leads him to Area 3 is the one near the Bathroom on the first floor and the Conservatory. It has a club shape on it.
• Key to Area 4, the Diamond Key (obtained by Boolossus): The door that leads the green-capped plumber to Area 4 is the second door found on the Balcony on the third floor. It has a diamond shape on it.
• Key to the Secret Altar (a.k.a Area 5), the Spade Key (obtained by Vincent Van Gore): The door that leads him to King Boo's hideout is located on the basement where Luigi goes through the hallway and reaches the last door. The door has a spade shape on it. It's also the only Special Key that's not dropped by a boss Portrait Ghost nor leads to a different area.

Luigi getting the Heart Key in Luigi's Mansion.

Artwork of the fourth and final Special Key, which leads to the Secret Altar.

Small image of a key.

Heart Key

Club Key

Diamond Key

Spade Key

The special keys icons, as they appear on the Game Boy Horror's map.

Special Keys in Luigi's Mansion: Dark Moon

• Key to the Cellar, the Elevator Key: When E. Gadd Figures out both where the spiders are coming from and a massive paranormal signal is (In the cellar, after beating A-5), he gives this to you to access the elevator and confront the source. (Appears in: A-Boss: Confront the Source)
• Key to the Eerie Stairway, the Wooden Key: After retrieving the key from the Sneakers and then Polterpup, E. Gadd repairs it and gives it back from Luigi to then explore the top of the tree and get the Dark Moon piece. (Appears in: B-4: Pool Party, B-5: Doggone Key, and B-Boss: Tree Topping)
• The Minute Hand: Obtained from beating the Ancient Poltergeist, one of the 3 missing parts of the Clock Tower Gate. (Appears in: C-2: Underground Expedition and C-3: Roundhouse Brawl)
• The Hour Hand: Obtained from catching Polterpup the second time, but he escapes again. The second of the 3 missing parts of the Clock Tower Gate. (Appears in: C-4: Play Catch)
• The Rotor Gear: Obtained from the first Strong Sneaker in the game, and the last part of the Clock Tower Gate. (Appears in: C-5: Piece at Last)
• The Front Door Key: A very elegant key used to access the front door to the Treacherous Manson, but was stolen by Polterpup. (Appears in: E-1: Front Door Key)

Luigi getting a Key in the Gloomy Manor of Luigi's Mansion: Dark Moon.

Luigi using the Dark-Light Device on a painting that contains a Key

Special Keys in Luigi's Mansion 3

Keys from the 3F - Hotel Shops:

• Key for the cash register in Accessories, the Diamond Key (obtained by Kruller): A silver key with a pink diamond-shaped gem in the bow. It's the first key to obtain in the floor and the first special key seen in the game. It's obtained at the beginning when Kruller let it fall accidentally in the Hallway to the Security Office. The player only has to go find it where it's fallen.

• Key for the cash register in the Boutique, the Heart Key (obtained in Accessories): A silver key with a pink heart-shaped gem in the bow. It's obtained inside the cash register in Accessories, but a Goob will steal it before Gooigi can pick it up. He'll have to defeat all Goobs to grab the key again.

• Key for the cash register in the Gift Shop, the Spade Key (obtained in the Boutique): A silver key with a purple spade-shaped gem in the bow. It's obtained inside the cash register in the Boutique. Before the player can obtain it, a mysterious entity will take it behind the front wall. Gooigi needs to open a secret compartment in that wall using the Strobulb in the Strobulb terminal behind the cash register. Inside he will find a lot of Coins and Mini Goobs, who he will have to defeat to obtain the key again. This is the first time when the Mini Goobs appear.

• Key for the cash register in the Barber Shop, the Club Key (obtained in the Gift Shop): A silver key with a purple club-shaped gem in the bow. It's obtained inside the cash register in the Gift Shop. The cash register will disappear with Spirit Balls. Gooigi need to use the Dark-Light Device to make it appear again.

• Key to the Security Office, the Star Key (obtained in the Barber Shop): A golden key with a golden star shape in the bow, surrounded by a silver border and having a hole in the upper-middle of the star. It's obtained inside the cash register in the Barber Shop. The cash register is hidden, Gooigi need to use the Dark-Light Device to make it appear again.

Keys from the 15F - Master Suite:

• The Red Key: Looks like the King Boo crown gem from this and the previous game, with a classic key section attached to it.
• The Blue Key: LIke the Red Key, but blue.
• The Yellow Key: Like the other two, but yellow.
• The Purple Key: Like every other one, but the gem has the same color as the real King Boo's gem.

Keys also sometimes appear in ScareScraper mode.

Trivia

• All normal keys from Luigi's Mansion 3 show a bow design similar to the form of The Last Resort in its Light version, with even a golden color to it. This design is actually the hotel's logo.
• The design of the 3F - Hotel Shops keys from Luigi's Mansion 3 are based in the four suits of cards, exactly like the ones from the first Luigi's Mansion game.
• In the animation were Kruller shows his first appearance, he's seen having a keychain with him, with some keys and the elevator button in it. The keys from it are more real looking than the others shown in the saga, but these don't appear again in the game. Their functions are unknown.
  • The Star Key to the Security Office is the only special key in the game to have a little hole in the bow, possibly referring to how Kruller, the main ghost to use the Security Office, has a keychain with him.