Luigi's Mansion 3 Gems 12F Locations and Collection Guide

Navigating the nautical hazards of Floor 12 in Luigi's Mansion 3 requires players to shift their focus from dusty hotel corridors to a full-scale pirate cavern known as The Spectral Catch. This uniquely themed floor hides six powerful collectible stones that demand creative mastery over the Poltergust G-00 mechanics. Unearthing each component requires an intimate understanding of the environment and a readiness to look past the obvious scenery.

The Secret Treasures of the Lobby and Docks

Before boarding the giant pirate vessel, you must thoroughly investigate the entry docks and elevator hallway for hidden anomalies. Near the starting point, players should use the Suction Shot on a loose floorboard to expose a hidden pipe leading directly underneath the floorboards. Sending Gooigi down into this cramped space allows him to retrieve the hidden Red Gem trapped beneath the wooden walkway.

Further along the path toward the main cavern, a peculiar palm tree stands near the sandy beach area. Launching a heavy coconut directly at the coconuts hanging from the branches triggers the release of the Green Gem. This straightforward puzzle serves as an excellent reminder to interact with the seemingly mundane background objects scattered throughout the resort.

Plunder on the Mighty Pirate Ship

Once you make your way onto the deck of the spectral ship, the environmental challenges become significantly more elaborate. On the left side of the main deck, players can spot a heavy wooden crate tucked behind some old ropes. Splitting this crate open with a well-aimed Suction Shot reveals the brilliant Purple Gem waiting to be claimed.

Tracking down the remaining maritime treasures forces players to use their strobe light functionality in creative ways. By accessing the upper crow's nest via a hidden ladder, Luigi can flash his Strobulb against a concealed mechanical chest. This action activates a trap door that drops the Yellow Gem directly onto the main deck below for easy retrieval.

Unearthing Hidden Submerged Jewels

The final pieces of the puzzle require a combination of coastal exploration and careful puzzle-solving around the water's edge. Walking along the far right side of the sandy beach reveals a partially buried treasure chest hidden among the rocks. Using the Dark-Light Device on this specific area materializes the structure and unlocks the Blue Gem.

Completing your collection requires one final trip back to the elevator hallway to check the decorative flags hanging on the walls. Using the vacuum function to rapidly spin the pirate tapestry on the right wall triggers a mechanism that releases the final Clear Gem. Securing all six pieces completes the achievement for Floor 12 and proves your mastery over this haunted pirate cove.