Reaching Floor 15 in Luigi's Mansion 3 represents the peak of your ghost-hunting journey inside the luxurious Last Resort hotel. Known as the Master Suite, this floor features intricate security systems, lavish penthouse rooms, and clever environmental puzzles that hide the final set of collectible gemstones. Gathering all six gems on this penthouse level requires precise gadget execution, sharp observation, and full mastery of both Luigi and Gooigi's abilities.
Navigating the Hallway Security and Unlocking Hallway Gems
The main hallway of Floor 15 acts as the central hub connecting Hellen Gravely's personal quarters. As you traverse this corridor, keep an eye out for hidden alcoves and interactive wall fixtures that react to your Suction Shot and Dark-Light Device. Using Gooigi to slip through metal grates in the floor unlocks access to hidden underfloor pipes where the first set of floor gems is safely stored.
In the main hallway, look for glowing emblems and subtle shadow misalignments on the walls. Shining your Dark-Light Device on missing furniture pieces reveals hidden chests containing valuable collectibles. Coordinating moves between Luigi and Gooigi ensures you can bypass laser grids without triggering alarms or missing elusive gems tucked behind decorative displays.
Solving the Bedroom and Bathroom Laser Puzzles
The Master Suite bedroom contains complex laser traps that block access to key areas. To solve the bedroom puzzle, use your Poltergust G-00 to rotate floor statues and redirect electrical currents or move heavy furniture blocking secret hatches. Deactivating the security sensors allows Gooigi to squeeze into narrow vents high up on the walls to retrieve the hidden gem.
Moving into the connected bathroom reveals additional environmental mechanics involving water pipes and vanity mirrors. Turn on the bathtub faucets and use the Suction Shot on floor drains to alter the room's mechanisms. Using the Dark-Light Device near the vanity mirror illuminates a hidden gem projection, which can then be grounded and collected.
Exploring the Lounge and Library Secrets
The penthouse lounge features an array of interactive luxury items, including record players, showcases, and suspended light fixtures. Vacuuming the large ceiling fan spins overhead gears that drop concealed items down to the carpeted floor below. Careful manipulation of the lounge displays reveals a hidden compartment containing the floor's purple gem.
In the library section, balance and height play a major role in reaching high shelves. Use Gooigi to activate weight switches on the upper balcony while Luigi operates ground-level lifts. Working together across both vertical levels unlocks the final glass vault holding the remaining gemstone for complete floor mastery.
Maximizing Collection Efficiency for 100 Percent Completion
Completing your gem collection on Floor 15 rewards you with exclusive achievements and special Suction Shot cosmetic upgrades back at Professor E. Gadd's lab. Before heading into the final boss encounter, double-check your inventory menu to confirm all six gem slots for the Master Suite are filled. Securing every gemstone across all 15 floors cements your status as a master ghost hunter in Luigi's grandest adventure.
