Find all six gems in 3F — Hotel Shops. 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 — Upper mall — elevator ledge
At the top of the escalators, Burst through the right-side gate. Follow the narrow outer route back over the elevator hall. Open the chest at the end of the ledge.
Red gem — Boutique
Enter as Gooigi, remove the dress from the mannequin and pull its exposed circular panel with Suction Shot. Enter the secret passage behind the mirror and vacuum the gem from the high beam.
Blue gem — Security-office corridor — vending machine
Flash the vending-machine sensor repeatedly until it dispenses the blue gem. Keep the machine intact; if you already broke it, leave the floor and return to reset it.
Green gem — Upper mall — invisible ladder
Use Dark-Light in the far-left upper corner near the accessories shop. Climb the restored ladder and follow the high walkway right to the chest.
Purple gem — Women’s Restroom
In the men’s restroom, remove the left wall panel to uncover a pipe. First reveal the missing floor drain with Dark-Light, send Gooigi below and turn the valve that drains the women’s room. Recall him, use the wall pipe and collect the gem from the toilet.
Yellow gem — Accessories shop
Use a suitcase and Suction Shot to smash the rear glass display. The yellow gem is among the treasures inside.
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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