Find all six gems in 9F — Unnatural History Museum. The colours are white, red, blue, green, purple and yellow. Gem collection is separate from the ending money rank; completing all seventeen floor sets unlocks Suction Shot Type-C.
Required tools and return visits
Unlock Gooigi and the Dark-Light Device before completing the floor. Clear the story route first if a door or room mechanism remains locked.
White gem — Elevator Hall — southeast cabinet
After the boss, bring a dinosaur bone back from the exhibit hall. Break the southeast glass cabinet and capture the crystal ghost.
Red gem — Reception chair
Spin the chair behind reception with a sustained air blast. Open the chest revealed underneath it.
Blue gem — Left corridor — hidden sensor
Remove the large plants hiding the green sensor. Flash it to raise the dinosaur display, then flash the safe sensor behind it.
Green gem — Elevator Hall — pterodactyl
Fire a dinosaur bone at the hanging pterodactyl near the elevator. Pick up the green gem that falls.
Purple gem — Elevator Hall — southwest cabinet
Break the southwest cabinet with a bone. Use Dark-Light on its empty display stand to restore the purple gem.
Yellow gem — Elevator Hall — glass display
Fire a dinosaur bone at the glass cabinet containing the visible yellow gem. Walk over the broken glass to collect it.
Six-gem check
Open the floor collection screen and check all six colour slots. A missing colour identifies the exact entry to revisit above. Gem ghosts must be fully captured before their gem is awarded.
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