List of Luigi's Mansion 3 glitches
This is a list of glitches in Luigi's Mansion 3.
NOTE: All names are conjectural unless otherwise specified.
Active Toad Painting After Boss
In The Great Stage, it is possible for the Toad painting to reactivate long after the boss has been defeated, with the Toad appearing in the picture despite also being safe in E Gadd's lab. If this happens, trying to free the Toad with the Dark-Light Device will just cause it to vanish from the picture.
If the music is not playing, making the Boo appear by examining its hiding spot will sometimes cause the found jingle to play, but the actual Boo will not appear, nor will its quote play beforehand. This leaves the game softlocked, since Luigi and Gooigi can only move when the Boo intro scene has finished playing, and they cannot exit the room without moving. They can enter E Gadd's Lab in this state, however.
Circling E. Gadd Glitch
On rare occasions, after freeing him with the Dark-Light Device, E. Gadd will immediately begin to circle around a specific spot. While in this state, he will not follow the player while in the room. The glitch will end either if the player waits for a little while or leaves the room. The cause of the glitch is still unknown.
E. Gadd T-Pose
Sometimes when calling the E. Gadd Hotline, E. Gadd will be in a T-pose for a frame.
Elevator/Plunger Impaired Movement
If Luigi exits the elevator holding a plunger shot, the plunger will vanish. After this, Luigi will be unable to aim up or down while using the flashlight or sucking/blowing with the Poltergust. Notably, Luigi will still be able to turn left or right. To regain normal mobility, the player must simply shoot another plunger.
Fitness Room Glitch
In the room with two Hammers (one with punching gloves and the other with weights), the player can sneak past them. Once the player comes through the door, they must walk down and to the left until they come to the doorway. If the Hammers are triggered at this point, the doors will all be barricaded and the player will be unable to continue.
Floating egg glitch
Great Stage Backstage area bugs
On other occasions however, Luigi can go backstage in the ghost battle in said room. If this is the case, then the ghosts will be unable to reach him, since they get stopped like there's an invisible wall in the way. Luigi can pull ghosts to this area with the Poltergust, but if he lets them go/they escape the tether, they'll immediately get warped back to the main stage area instead.
Invisible Wall in Theatre
Sometimes, if Luigi uses the Suction Shot to demolish the back wall of the main theatre area in the Great Stage, then returns when ghosts are present in the area, it will be impossible for him to reach the backstage area with the TV, since there'll be an invisible wall in the way. If this is the case, this wall will stay even if Luigi exits and re enters the area, or the ghosts are defeated.
No Boo Music
On certain occasions, the music usually played when a Boo is present in a room does not play. This makes it difficult to track down said Boo without buying a radar from E Gadd.
Punching Bag Sound Overlap
On the 13th Floor, Fitness Center, in the Weight Room, there is a punching bag that sometimes plays its hit sound multiple times at once when struck with a boxing glove creating a jarring sound.
Ongoing Bomb Ticking
During the Boolossus battle, when the bombs are being launched back into Boolossus's mouth and a bomb is about to explode, the bomb will make an ongoing ticking sound. The bomb cannot be interacted with or picked up while the glitch is in effect. The bomb will then explode and end the glitch upon the next round of bombs.
Toad falling through floor
Sometimes during the "Find the Toads!" event, after two players clear a room with Toad and another player tries to suck him up with their Poltergust G-00 right before he stops panicking, Toad will continuously fall through the floor. He will still be able to follow the player when he keeps reappearing. The player can fix this glitch by timing the suction of Poltergust G-00, though it is rather precise.
Unbeatable Boolossus Battle
On rare occasions during the battle with Boolossus, after it explodes and Boos fall down and stunned, one Boo may be unable to be slammed on the ground and freeze in place. This causes the Boolossus battle to be unbeatable and also unknown how it happens.
Twisted Suites Crash
It is possible to cause the game to crash to the home menu if Luigi shoots a fish into the rabbit cage in the Trainer's Room in Twisted Suites.
NOTE: As of these patches, performing these glitches is impossible.
Polterpup stuck on Luigi (version 1.0.0 only)
At the beginning of the game after defeating Goobs in the Grand Lobby floor, a cutscene shows Polterpup going up the stairs to where the player collects the key; however, in version 1.0.0, a glitch occurs where after the player captures the last Goob and Polterpup appears at the last moment teaching the player how to capture ghosts, he gets stuck on Luigi. This prevents him from using Burst to progress, and if the game is saved automatically, the save file becomes softlocked and must be erased to start over.