Castle MacFrights is a weird place. Honestly, by the time you reach the sixth floor of the Last Resort hotel, you’ve probably realized that Luigi’s Mansion 3 isn't just about catching ghosts; it’s about being a borderline obsessive-compulsive interior decorator who tears apart every tapestry in sight. If you’re hunting for Luigi's Mansion 3 6F gems, you’re dealing with a medieval-themed gauntlet that loves to hide its treasures behind fake walls and annoying environmental puzzles.
It's frustrating. You see the gem. It's right there. But the path to it is blocked by a suit of armor or a literal stone wall.
Most players breeze through the boss fight with King MacFrights—which is a blast, by the way—and then realize they’ve only found maybe one or two of the six gems hidden in the masonry. That’s because the designers at Next Level Games were particularly cruel with the verticality of this floor. You aren't just looking left and right; you're looking up, down, and behind the scenes.
The Coliseum Entrance Red Gem
Let’s get the easy one out of the way first. Or at least, the one that feels the most like a classic Luigi puzzle.
When you’re in the Hall of Armor, you'll see a bunch of those iconic suits of armor lining the walls. Most of them are just there for atmosphere (and to jump-scare you), but one of them is holding a secret. You need to use your Suction Shot on the chest plate of the armor in the upper-right corner. Yank it down.
Inside? Nothing.
Wait. Don't leave yet. After the armor breaks, you’ll notice a circular indentation on the wall where the armor was standing. You need to flash your Strobulb at the green light that appears. It’s a bit finicky. If you don’t hit it at the right angle, nothing happens. But once it triggers, the wall flips, revealing the Red Gem. It’s a simple "Aha!" moment that sets the tone for the rest of the floor.
Dealing with the Coliseum Balcony Clear Gem
This one is tucked away in the Coliseum Balcony area, and it’s arguably the easiest to miss if you aren't a completionist who vacuums every square inch of carpet. There’s a suit of armor near the top-left of the hallway. If you poke around it, you’ll notice it looks a bit... off.
Basically, you just need to keep walking past it toward the screen. There’s a hidden path. It’s one of those classic "walk through a wall that looks solid" tricks that Nintendo loves. Follow the narrow ledge behind the banners, and you’ll find a chest containing the Clear Gem.
Why do they do this? Because they know most people are sprinting toward the boss arena. Slow down. Look at the shadows.
The Tricky Yellow Gem in the Cage
The Yellow Gem is a pain because it requires Gooigi, and if you’re playing solo, the timing can feel a bit clunky. In the Cage Lift Room—you know, the one with the giant wind-up mechanism—you’ll see the gem sitting inside a cage.
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Luigi can’t get in. Obviously.
You need to position Luigi on the lift and use the vacuum to rotate the fan, which moves the lift up or down. But the gem is trapped behind bars. You have to send Gooigi through the bars of the cage while the lift is at the correct height.
Here is what most people get wrong: they try to do it while the lift is moving. Don't. Stop the lift exactly level with the cage floor. Switch to Gooigi, slip through, and grab the gold. If you fall through the floor as Gooigi (because of the grates), just try again. It’s all about the positioning of the lift.
The Cellar’s Blue Gem
The Blue Gem is located in the Cellar, and this is where the game expects you to remember your basic mechanics. There’s a large keg in the room. You might think you need to break it. You don't.
You need to open it.
Use your Suction Shot on the plug of the giant barrel on the right. Once it’s open, head inside. Walk through the barrel to the right, and you’ll find yourself in a hidden sub-room. There’s a ladder. Climb it.
You’ll find the Blue Gem sitting on a high shelf that was previously invisible from the main floor. It’s a great example of how Luigi’s Mansion 3 uses 3D space. The game constantly hides things in "the foreground" or "the background" that the fixed camera angle hides from you.
The Green Gem and the Hidden Room
In the Royal Corridor, there’s a spot where the hallway seems to just... end. But if you look at the rug, it’s tucked under a wall.
Use your Dark-Light Device.
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Shine it on the wall near the middle of the corridor, specifically where the shadow seems a bit inconsistent with the rest of the stonework. You’ll reveal a door. Go inside. This is a small treasury filled with gold, but the Green Gem is the real prize. It’s usually trapped in a breakable object or sitting in plain sight once you’ve cleared the "spirit balls" that appear after using the Dark-Light.
Honestly, the Dark-Light is your best friend on 6F. If something looks symmetrical but isn't, blast it with the rainbow light.
The Final Purple Gem
The Purple Gem is found in the Armory. This room is crowded, and it’s easy to get distracted by all the breakable crates.
Look at the back wall. There’s a suit of armor that looks like it’s guarding a specific brick. Use your Suction Shot on the wall itself—there’s a loose brick or a hanging tapestry that can be interacted with. Actually, in this specific room, you need to shoot a heavy object (like a stray helmet) at the glass display case or the weakened part of the wall in the upper-right section.
The wall will crumble, revealing a secret compartment. The Purple Gem will pop out.
It’s worth noting that 6F is one of the few floors where the gems feel naturally integrated into the "castle" theme. They aren't just random collectibles; they feel like part of the hoard King MacFrights would actually keep.
Actionable Tips for 100% Completion on 6F
If you’re still struggling to find these, keep these three rules in mind:
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- Vacuum the Walls: Not just the floor. Tapestries often hide alcoves or Dark-Light triggers.
- Gooigi is a Liquid: If there’s a grate, a cage, or a pipe, Gooigi should be going through it. The Yellow Gem is the biggest test of this on the floor.
- The Suction Shot isn't just for combat: Use it on every circular shield or loose-looking stone you see.
Once you’ve collected all six, you’ll unlock the achievement for Floor 6. It doesn’t give you a gameplay boost, but if you’re going for that gold Luigi statue at the end of the game, you can’t afford to skip these. Go back to the lab, check your gallery, and make sure the 6F slot is full. If it's not, you likely missed the hidden path on the Coliseum Balcony. That's the one that trips everyone up because it relies on "camera trickery" rather than a logic puzzle.
Head back in there, keep your flashlight charged, and don't let the ghosts distract you from the loot. Your next stop is the 7F garden, which is a whole different kind of headache. Good luck.