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| The Lab
| Normal Ghosts
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The Lab is a room in Luigi's Mansion. It is here that Professor E. Gadd informs Luigi about the mansion and its ghosts near the beginning of the game, and later provides information on Boos. This is also where E. Gadd asks the player where they want to go; to the Mansion, the Training Room, the Gallery, or, once the game is beaten, the Hidden Mansion.
- If the player looks in this room closely or uses the Game Boy Horror in the Training Room or the Gallery, they will notice that there is a wooden ladder visible, showing that E. Gadd's headquarters is underground.
- When the game was under beta development, it was possible to explore The Lab and the Ghost Portrificationizer Room as if they were full maps. It was also possible to climb the ladder in The Lab, but it does not lead to anything; this could imply that the Player was able to explore the outside regions of Luigi's Mansion. It is possible for one to access these rooms with an Action Replay code, but the doors leading to the other rooms won't be openable.