Exploring the Unnatural History Museum on the ninth floor of Luigi's Mansion 3 presents players with a unique blend of prehistoric dangers and clever puzzles. This exhibit features ancient bones and fragile displays that hide a total of six collectible jewels scattered throughout the corridors. Finding all of them requires mastery over your Poltergust G-00 functions, including the Suction Shot, Dark-Light device, and your trusty gooey clone partner.
Uncovering the Hidden Lobby Treasures
Before you enter the main showroom, the elevator lobby area contains three distinct collectibles hidden behind environmental mechanics. The first jewel is found by utilizing the Suction Shot to destroy the modern desk situated on the right side of the room, exposing a hidden mechanism. You will then need to pull the newly revealed chain to open a secret safe containing the treasure.
The second jewel requires you to head over to the elevator shaft and use the Burst move directly under the green plant structure. This action shakes the foliage loose, dropping a beautiful green gem straight down to the floor for collection. For the third item, you must use your Dark-Light device on the empty space near the left wall to reveal a missing display case.
Solving the Main Exhibition Room Puzzles
Once you enter the central bone exhibit, the environment becomes much more interactive and dangerous. The fourth gem is trapped inside a fragile glass case on the right side of the main prehistoric floor layout. You must pick up a heavy bone from the nearby dinosaur skeleton remains and launch it directly at the structure to break the casing.
The fifth collectible requires careful cooperative positioning between Luigi and Gooigi to reach an elevated point. Send Gooigi into the pipe located behind the left pillars to ascend to the top rafters overlooking the fossil displays. From there, your clone can perform a Burst move near the hanging bones to shake loose the purple gem.
Capturing the Final Exhibit Gem
The sixth and final jewel becomes available only after dealing with the massive Tyrannosaurus Rex skeleton boss that dominates the main arena. After the dramatic combat sequence concludes, a mischievous ghost will flee the area with the last collectible in its possession. You must track this specter down using your specialized light tools to reveal its hidden location in the corridor.
Once the entity is blinded by your flashlight, slam it repeatedly into the ground to retrieve the final stone. Collecting all six stones on this floor grants you an achievement and completes your museum inventory checklist. Mastering these specific mechanics makes achieving absolute completion in your overall hotel journey much easier.
