You finally made it to the Spectral Catch. Honestly, the 12th floor is one of the coolest looking areas in the entire Last Resort hotel, but man, those Luigi's Mansion 3 12f gems are a massive pain to track down if you aren't looking in the right corners. You’re dealing with a pirate-themed floor that’s basically a giant beach, a ship, and a lot of sand.
It's easy to get distracted. You've got a giant ghost shark trying to eat you and a ship that needs exploring. Most players just breeze through the boss fight, grab the elevator button, and realize later they missed every single collectible on the floor. Don’t do that.
Finding these six stones requires a mix of the Dark-Light bulb, some heavy-duty vacuuming, and a weird amount of interaction with the environment that the game doesn't always make obvious.
The Yellow Gem: Hidden in Plain Sight near the Elevator
Let's talk about the elevator hall. It feels empty. You walk out, see some tropical decor, and your brain tells you to keep moving toward the beach. Stop.
Look at the carpet right in front of the elevator. There's a little bit of a bump. Use your Suction Shot on the floor near the right side of the hallway. You'll notice a pipe sticking out of the wall that looks a bit suspicious. You actually need to use Gooigi here. Send the green clone through the pipe on the right wall. He’ll pop out behind the counter area where you can see the yellow gem sitting there like it’s no big deal.
It’s a classic Nintendo move. They put the first one right at the start to make you think the rest will be easy. They aren't.
The Red Gem: The Mermaid Statue Mystery
Once you hit the beach—the Lounge area—you’ll see a mermaid statue. It’s sitting on a rock on the left side of the room. At first glance, it just looks like set dressing. It isn't.
You need to grab a coconut. There are plenty of palm trees around, so just give one a Suction Shot or a burst of air to knock a coconut down. Pick it up with the Poltergust G-00 and chuck it straight at the statue.
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Wait. Nothing happened?
That's because you have to do it multiple times. Hit it once, and a ghost might pop out. Hit it again. Eventually, after a few well-aimed tosses, the statue will break apart, and the Red Gem will pop out. It’s frustrating because the game doesn't give you a health bar for the statue or anything. You just have to be persistent. Most people give up after one throw. Don't be that person.
Why 12F is a completionist's nightmare
The thing about Luigi's Mansion 3 12f gems is that they require backtracking. You can't just run through the level in a straight line. The physics engine in this game is incredible, and 12F uses it to hide things under sand and behind breakable objects.
If you aren't vacuuming every square inch of sand on that beach, you're going to miss out. There are heaps of sand that hide coins, pearls, and occasionally, the triggers for these gems.
The Blue Gem: The Hidden X on the Floor
This one is arguably the most "pirate" of the bunch. In the same beach area (the Lounge), head to the far right. You’ll see a bunch of crates and a suspiciously empty patch of sand.
Use your vacuum. Suck up all the sand in that corner. You’ll eventually reveal a red "X" on the floorboards beneath the sand. It’s a literal "X marks the spot" trope. Once the X is fully visible, use your Suction Shot (the plunger) on it and slam it down. The floor will break open, and the Blue Gem is yours.
It’s simple, but if you don't clear the sand, the Suction Shot won't latch onto the wood. It’s a two-step process that catches a lot of people off guard.
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The Green Gem: Trapped in the Sand
While you’re still in the beach area, look toward the water on the far right. There’s a tiny island or a patch of land that looks a bit isolated. You’ll see a plant or a piece of debris sticking out of the sand.
Use the vacuum.
Seriously, just keep vacuuming. There is a huge mound of sand here. As you clear it away, you’ll find a chest. Open it up, and—surprise—it's the Green Gem. It feels a bit repetitive with the Blue Gem, but the location is different enough that it’s easy to overlook if you’re focused on the ship in the background.
The Purple Gem: The Sand-Crab Struggle
Okay, this one is annoying. On the way to the ship, there's a long stretch of beach. Look for a tiny patch of sand that looks like it's vibrating or moving slightly.
Vacuum it.
A chest will appear. But when you try to open it, it’s not that simple. Sometimes a ghost will intervene, or the chest is actually a trap. For the Purple Gem on 12F, you're looking for a specific spot on the far left of the beach, near where the water meets the sand. You need to use the Dark-Light on a spot that looks like a missing piece of a boat.
Once you reveal the hidden boat parts with the Dark-Light, a chest appears. Inside isn't the gem, but a bunch of ghosts. Beat them. Then, look for a nearby crate or a hidden spot in the sand nearby. The Purple Gem is actually held by a golden crab that spawns after you've messed around with the environment enough. Chase the crab, flash it with your Strobulb, and it’ll drop the gem.
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The Clear Gem: The Ship's Secret
Finally, the Clear Gem. This is on the ship itself.
Go to the captain’s cabin or the upper deck area. On the left side of the ship's mast area, there's a hanging crate. Most people try to Suction Shot it or blow it away. Neither works.
You need to use Gooigi to climb up or use the nearby environment to reach a higher vantage point. Actually, the easiest way is to look for the pulley system. Use your vacuum to pull the rope, which lowers the crate. Once the crate is on the deck, smash it.
Wait, that’s not it.
Actually, the Clear Gem is even more hidden. Look for the flag at the back of the ship. Use your vacuum to pull the flag line. The flag will move, and the gem will drop out of the crow's nest or a hidden compartment near the mast. It's all about interacting with the rigging of the ship.
Pro-Tips for Gem Hunting in the Last Resort
If you're struggling to find the exact "sweet spot" for these, remember a few universal rules for Luigi's Mansion 3:
- Vibrate is your friend: If your controller starts shaking, something is nearby.
- The Dark-Light is mandatory: If a space looks empty but "feels" like something should be there, shine the light.
- Gooigi can go where Luigi can't: Always check for pipes or grates. 12F has several hidden pipes that only the green guy can fit through.
- Physics are the key: If you see something hanging, pull it. If you see something loose, blow it away.
What to do next
Once you've collected all the Luigi's Mansion 3 12f gems, you'll get that satisfying "Floor Cleared" notification. But don't just stop there.
- Check the Elevator: Make sure the gems actually slotted into the frame. Sometimes the game saves weirdly if you exit to the lab too fast.
- Hunt the Boo: Every floor has a Boo. On 12F, his name is Boodini. He usually hides in the crates or the sand piles in the Lounge. If you're already gem hunting, you might as well grab him too.
- Upgrade your Poltergust: If you're doing a 100% run, take those gems back to Professor E. Gadd. They don't give you power-ups, but they unlock the special Diamond Suction Shot skin once you collect every single gem in the hotel.
Finding every collectible in the Spectral Catch is mostly about patience. You’re a plumber fighting ghosts on a pirate ship—don't rush the process. Vacuum the sand, break the statues, and keep your Dark-Light ready. You'll have the full set for the 12th floor in no time.