Find all six gems in 15F — Master Suite. 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 — Southwest hallway — shadow sculpture
Rotate the pedestal with the Poltergust until its shadow matches the Boo picture. When the picture changes, rotate again to match Luigi’s outline. Collect the white gem after both matches.
Red gem — Library — missing book
Disable the lower-level lasers and go through the left door to find the solid brown book. Carry it upstairs and place it in the empty slot on the right bookshelf.
Blue gem — Master Bathroom — lower pipe
Turn off the shower and send Gooigi down the drain. Move toward the foreground, then left, and enter the lower pipe to emerge on the wooden walkway holding the blue gem.
Green gem — Lounge — coffee tables
Put Luigi and Gooigi on the two coffee tables in the lowered seating area. Keep both occupied until the green gem appears.
Purple gem — Lounge — elevator enclosure
Send Gooigi through the upper-left wall pipe. Walk around the top of the elevator structure and drop into the hole behind its pillar to reach the purple gem inside the shaft.
Yellow gem — Master Bedroom — seesaw
Use Suction Shot on the right mannequin to create the seesaw. Climb with Gooigi, balancing each side in short movements while avoiding the lasers. At the highest position, walk through the bars to the yellow gem.
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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