Floor 14: The Dance Hall

Elevator Hall: Enter the hall and step on the unlit floor tiles to illuminate them all. Stepping on already lit tiles will turn them off. Once all lights are green, two tiles will be unlit. Send Luigi to one and Gooigi to the other.

Hidden Vault: After the puzzle, stairs appear. Send Gooigi through the bars to achieve the "Snuck Into the Hidden Vault" achievement and collect Coins, Bills, the Yellow Gem, and Gold Bars.

Strobe Switch: Return upstairs and flash the machine with a strobe switch near the elevator for Bills.

Sofa & Disks: Head south onto the red carpet, then left. Find Coins on the sofa and turn the two wall disks. A brick block will appear; use Gooigi to reveal Coins and the Purple Gem.

Corridor Shops: Head east down the corridor to find three shops. Interact with the ticket booth's cash register for Coins.

Hammer & Slinker: A Hammer and a Slinker ghost will appear. Defeat them by slamming one into the other. Collect Bills from the counter boxes.

Accessories Store: Head east to the accessories store. Burst open the entrance and collect items like bags and T-shirts for Gold. Suck up items from the trashcan in the upper-left for Coins and the cash register for Cash.

Clothes Shop: Take down the poster on the left to reveal the clothes shop entrance. Suck up clothes on the left to reveal Gold and the floor's Green Gem. Collect Coins from clothes on the right and the upper-left safe.

Gold Disk & Spiders: Suction Shot the gold disk on the wall and pull it down to reveal a hole. Suck up the spiders and the Gold Spider that emerge for Gold.

Possessed Trash Can: Return to the hallway and head right. The trash can is possessed. Avoid its dash attack, shoot it with your plunger, and use Dark Light to suck up the orbs. Open it for Gold.

Ventilation Pipe: Remove the ventilation lid on the eastern wall and have Gooigi swim through for more Treasure.

Dance Floor Entrance: Head up the stairs to the double doors and enter the next room.

Dance Floor Puzzle: Grab the elevator button on the dance floor. Speakers will blast music, causing you to drop it. You'll meet DJ Phantasmagloria and eight hip hop ghosts. Identify the ghost holding the button (it dances slower). Get close and Burst to make it throw the button. Repeat this process until you identify the correct ghost, then stun and suck it up.

DJ Phantasmagloria Boss Fight: The Disco Lady will grab the button and fight you. Dodge her fiery records and get close. Burst to blow off her wig, then flash her with your light and suck her in. Repeat this process until her health is depleted.

15th Floor Button: After defeating DJ Phantasmagloria, collect the 15th Floor Button.

Electrical Socket: On the dance floor, have Luigi and Gooigi stand on the two unlit tiles to reveal an electrical socket. Plug in the Poltergust and suck up the speaker, lights, and brick wall to reveal a secret room (DJ Phantasmagloria's desk).

DJ's Desk: Suck up everything on the desk. Find Bills within the head mannequins on the left. Use Dark Light on the mannequin without a wig on the eastern shelf to find and collect the floor's Blue Gem.

Upper Areas: Flash the strobe switch to reveal steps leading to the upper east and west sides of the room.

Western Steps: Head up the western steps. Use Dark Light to the south to find an invisible tall table. Reveal it to find a Gem Goob. Defeat it to find the floor's Clear Gem.