Exploring the Unnatural History Museum on Floor 9 of Luigi's Mansion 3 presents players with a unique blend of prehistoric exhibits and clever environmental puzzles. Finding all six hidden gems on 9F requires using Luigi's specialized equipment effectively alongside Gooigi. This collection guide details every gem location on the 9th floor to ensure players achieve full completion without missing a single secret.
Finding the Red and Blue Gems in the Exhibit Halls
The Red Gem is hidden right inside the main Exhibit Hall near the entrance area. Players must use the Suction Shot on the glass display case containing a dinosaur fossil to smash it open. Once broken, the gem reveals itself and can be picked up immediately by Luigi.
To locate the Blue Gem, head to the elevator hall and clear away the curtain on the left side using the Poltergust G-00. Revealing this hidden recess uncovers a glowing blue jewel sitting behind a protective barrier. Switching to Gooigi allows you to slip through the grate and retrieve the gem effortlessly.
Unlocking the Green and Yellow Gems
The Green Gem is concealed in the main exhibition room containing the massive T-Rex skeleton footprint. Players need to blow air onto the central display case to rotate the mechanism until it drops the gem. Working alongside Gooigi speeds up this environmental puzzle significantly.
For the Yellow Gem, navigate toward the hallway lined with glass cases and locate the gold frame on the wall. Using the Dark-Light Device on the empty picture frame brings the hidden item back into reality. Once fully restored, the Yellow Gem pops out onto the floor for easy collection.
Securing the Purple and White Gems
The Purple Gem can be uncovered near the gift shop area by interacting with the interactive displays. Use the Suction Shot to pull down the hanging decoration near the corner of the room. This triggers a secret compartment to open, dropping the gem directly at Luigi's feet.
Finally, the White Gem requires tracking down a hidden ghost disguised within a piece of museum decor. Flash the Dark-Light Device near the plant display to reveal a hidden ghost, then defeat it in battle. Defeating this unique enemy rewards players with the final gem needed to complete the 9F collection.
