The Main Observation Room is Hellen Gravely's office, located in the northern section of the Master Suite in Luigi's Mansion 3.
Description[]
The Main Observation Room consists of 14 screens that enable Hellen to monitor the other fourteen floors of the hotel, a spinning throne chair, a desk, a circular cushion chair, a model of the Last Resort, an artwork of King Boo on the floor, and a ceiling light based on King Boo's crown jewel.
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| Characters | Protagonists | Gooigi • Luigi |
| Antagonists | Hellen Gravely • King Boo | |
| Supporting characters | Mario • Polterpup • Professor E. Gadd • Princess Peach • Toads | |
| Bosses | Amadeus Wolfgeist • Boolossus • Captain Fishook • Chambrea • Chef Soulfflé • Clem • Serpci • Steward • Kruller • Nikki, Lindsey, & Ginny • King MacFrights • Dr. Potter • Morty • Polterkitty • Ug • Johnny Deepend • DJ Phantasmagloria • Hellen Gravely • King Boo | |
| Enemies | Normal ghosts | 16 Boos • Gem Goob • Golden Goob • Goob • Hammer (Disco Hammer • Hammersaurus Rex • Slabhammer • Tutankhamer) • Mini Goob • Mini Hammer • Mummy • Oozer • Slinker • Spirit Ball • Trapper |
| Rare ghosts | Speed Goob • Speed Hammer • Speed Oozer • Bomb Goob • Bomb Hammer • Bomb Oozer • Regen Goob • Regen Hammer • Regen Slinker • Lethal Goob • Lethal Hammer • Lethal Oozer • Lethal Slinker • Thieving Slinker • Medic Goob • Electric Oozer • Diffusing Goob • Diffusing Hammer • Warp Slinker | |
| Other enemies | Bat • Crow • Mouse • Possessed Bin • Snake • Spider • Takarabako Obake | |
| Items and objects | Items and objects | Bill • Bomb • Coin • Coin pile • Elevator button • Elevator tracker • Gem • Gold Bar • Gold Bone • Key • Pearl • Boo Ball • Trap Detector |
| Equipment | Equipment | Dark-Light Device • Flashlight • Poltergust G-00 • Strobulb • Suction Shot • Virtual Boo |
| Rooms | Boilerworks | Drainage Control • Drainage Control Hall • Elevator Hall • Main Tank • Observation • Old Reservoir • Reservoir • Sewer A • Sewer B • Sewer C • Storage Room • Waterworks |
| Basement | Elevator Shaft • Garage • Laundry Room • Lab • Service Hallway • Service Stairwell | |
| Grand Lobby | Lobby | |
| Mezzanine | Ballroom • Dressing Room • Entertainment Room • Lobby • Hallway • Kitchen • Restaurant • Restroom • Storage Room | |
| Hotel Shops | Accessories • Barber Shop • Boutique • Coffee Shop • Elevator Hall • Gift Shop • Hallway • Lost and Found • Mall Lobby • Restroom • Security Office | |
| The Great Stage | Auditorium • Concession Stand • Dressing Room • Elevator Hall • Restroom | |
| RIP Suites | Elevator Shaft • Hallway • Laundry Room • Room 501 • 501 Bathroom • 501 Balcony • Room 502 • 502 Bathroom • Room 503 • 503 Bathroom • Room 504 • 504 Bathroom • Room 505 • 505 Bathroom • Room 506 • 506 Bathroom • Room 507 • 507 Bathroom • Room 508 • 508 Bathroom • 508 Balcony • 5F Exterior | |
| Castle MacFrights | Antechamber • Armory • Bridge Room • Cage-Lift Room • Cart Storage Room • Cellar • Coliseum • Coliseum Balcony • Coliseum Hallway • Dungeon • Front Gate • Hall of Armor • Royal Coffers • Stairway • Waterwheel Room | |
| Garden Suites | Atrium • Blooming Bathroom • Blooming Suite • Elevator Hall • Ivy Bathroom • Ivy Suite • Mushroom Suite • Thorny Bathroom | |
| Paranormal Productions | Backstage • Editing Room • Elevator Hall • Entrance Hall • Studio Entrance • Studio 1: Horror Set • Studio 2: Castle Set • Studio 3: Fire Set • Studio 4: Micro Set • Studio 5: City Set | |
| Unnatural History Museum | Elevator Hall • Exhibit Hall | |
| Tomb Suites | Altar Chamber • Central Chamber • Elevator Hall • Hidden Passageway • Jewel Chamber • Pit Chamber • Sandy Grand Hall • Scale Chamber • Secret Passageway • Snake Chamber | |
| Twisted Suites | Bladed Bedroom • Elevator Hall • False Bedroom • Gallery • Hall • Illusion Bathroom • Inverted Bedroom • Laundry Room • Lounge • Mirror Bathroom • Stage • Suit Bathroom • Trainer's Bedroom • Wardrobe • Water Tank Bathroom | |
| The Spectral Catch | Beach • Elevator Hall • Grotto Lounge | |
| Fitness Center | Elevator Hall • Gym Lobby • Locker Room • Pool • Pool - Back Access • Shower Room • Training Room • Weight Room • Yoga Room • 13F Exterior | |
| The Dance Hall | Dance Floor • Elevator Hall | |
| Master Suite | Drawing Room • Hallway • Library • Lounge • Main Observation Room • Master Bathroom • Master Bedroom | |
| Other | Other | ScareScraper • ScreamPark • The Last Resort |
| Further info | Further info | Beta elements • Gallery • Quotes |