Area One

Area One, is considered the first area in which you can explore in Luigi's Mansion. This is the first explorable area in the game. The main room in Area One would be conisdered the Foyer, which is the first room you enter. After this, you get directed to the Parlor. There you are almost attacked by several Gold Ghosts. After equipping the Poltergust 3000 for the first time, which was handed to him by Professor E. Gadd, the lights blow out. The room gets dark and the painting begin to talk. After battling several ghosts, Luigi receives a key to the Anteroom, and the lights come back on. After that you are free to explore around Area One.

Foyer:
The foyer is the enterance to the mansion, When first entering a Gold Ghost drops a key in the center of the room. When returning to the Foyer, a Toad is seen crying about Mario disappearing. After Luigi  and Toad talk, Toad is happy and the lights turn on. The Gold Ghost is the only ghost Luigi encounters in the Foyer. All of the mirror found throughout the mansion, link to this room.

The Foyer is the only room, with the exception of hallways, to have two floors. The door to the first floor is blocked by a force field, which can be broken by getting a key, after defeating  Chauncey. When first coming up the staircase, the double doors at the top lead to the Parlor, Anteroom, Wardrobe Room and the second floor balcony. The door on the left leads to the  Study,  Master Bedroom,  Nursery, and  The Twins' Room, all home to a member of the  Portrait Ghost family. In the middle of the room is a big chandelier. When Luigi steps underneath it, before he defeats Chauncey, the chandelier will spin, fall down and attack Luigi. Then Luigi can hear Chauncey's laugh.