Look, we've all been there. You're wandering around a creepy hotel, vacuuming up dusty rugs and old newspapers, wondering why on earth Luigi agreed to this vacation in the first place. This Luigi's Mansion 3 walkthrough isn't going to be some dry list of buttons to press. Instead, let's talk about how you actually navigate the Last Resort hotel without getting stuck on that one annoying boss or missing a single hidden Boo.
It's a big game. Honestly, it's way bigger than the original GameCube classic or the 3DS sequel. You've got 17 floors of chaos, and each one feels like its own little movie set. Some people think you can just breeze through the story, but if you aren't using the Suction Shot or the Dark-Light Bulb correctly, you're basically playing with one hand tied behind your back.
The First Few Floors and Getting Your Bearings
The game starts slow. You get the Poltergust G-0M from Professor E. Gadd’s car in the garage, and suddenly the world opens up. Most players mess up early by ignoring the environment. See a trash can? Slam it. See a poster? Vacuum it off the wall.
The RIP Suites (Floor 1) and the Grand Lobby (Floor 2) are basically extended tutorials, but they hide some of the trickiest gems in the game. You'll need to learn the "Burst" move—hitting A and B together—to jump over shockwaves. If you don't master this by the time you hit the Chef Soulfflé boss fight on the Mezzanine, you're going to have a bad time. He throws frying pans like a pro, and you need that Burst to clear the smoke and keep your footing.
Why Gooigi is Literally Your Best Friend
You can't finish a Luigi's Mansion 3 walkthrough without talking about the green, gelatinous doppelganger. Gooigi is the MVP. He can slip through vents, walk over spikes, and fall through drains.
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But he has a massive weakness: water. One drop and he’s toast.
I’ve seen so many people get stuck on the Boilerworks (B2) because they forget they can control both characters at once. Sometimes you have to leave Luigi turning a valve while Gooigi navigates a pipe maze. It’s a rhythmic thing. You click the right stick to swap, but if you double-click, you recall him. Timing is everything here. Especially when you're fighting Clem—that grumpy ghost in the pool. You have to use the vacuum to propel your swan floatie, which feels clunky until it suddenly doesn't.
The Hidden Depth of the Dark-Light Bulb
Don't just use the Dark-Light for ghosts. Use it on everything that looks like it's missing. If there’s a gap in a row of books or a suspiciously empty corner in a room, shine that rainbow light. You'll find Spirit Balls. Suck those up to reveal hidden chests. This is how you find most of the Boos later in the game. Each floor has one Boo, and they only show up after you’ve cleared the main boss of that area. They like to hide in objects that vibrate—your controller will shake when you’re close.
Navigating the Mid-Game Difficulty Spikes
The game really picks up around the Garden Suites (Floor 7) and Paranormal Productions (Floor 8).
The Garden Suites is a vertical nightmare. You’re climbing a giant plant, and the boss, Dr. Potter, is a total jerk with a saw blade. You have to lure him into biting a specific type of gourd so his saw gets stuck. It’s all about baiting. If you rush him, he’ll just shred your health.
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Then there’s the movie studio floor. This is widely considered the best part of the game. It’s a puzzle where you have to carry a megaphone through different "sets"—a fire set, a water set, a castle set. You’re essentially acting as a director. If you lose the megaphone, check the back of the sets. It usually resets there. The boss here, Morty, is actually a nice guy. You don't even have to fight him if you don't want to, but if you want that floor button, you have to help him finish his film.
Mastering the Poltergust G-0M Mechanics
A lot of players struggle with the physical combat. It's not just "point and suck."
- The Slam: Once you’ve got a ghost in your stream, wait for the meter to fill, then hammer the A button. You can slam one ghost into another to deal massive area-of-effect damage.
- The Suction Shot: Use the plunger (Y button) on shields, glasses, or anything smooth. Then pull. This is the only way to disarm the "Hammer" ghosts who wear armor.
- The Strobulb: You can charge this. A fully charged flash stuns multiple ghosts at once.
The Late Game: Tomb Suites and The Twisted Suites
By the time you reach Floor 10 (Tomb Suites), the game stops holding your hand. There’s a literal pyramid inside the hotel. The sand mechanics are actually pretty impressive—you can vacuum sand to build mounds or blow it away to find floor switches. The boss here, Queen Taihu, requires you to vacuum her sand-snake armor off piece by piece.
Floor 11, the Twisted Suites, is where the "three sisters" magic act happens. It’s a trip. The rooms shuffle, doors lead to nowhere, and you’ll feel like you’re losing your mind. The trick is to watch the hats during the boss fight. One of the sisters will always have a slight tell—a flicker or a sound—that gives away which hat she’s hiding in.
How to Handle the Final Stretch and King Boo
The last few floors—The Dance Hall (Floor 14) and the Master Suite (Floor 15)—are pure tests of everything you've learned. The Dance Hall boss is basically a rhythm game. You have to Burst at the right time to knock the disco king off his feet.
The final showdown with King Boo on the roof is a marathon. It’s a three-phase fight.
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- Phase one: Avoid the lightning and bombs.
- Phase two: He clones himself. Watch for the real one—he’s usually the one who doesn't look slightly transparent or "off" in his animations.
- Phase three: It’s a timed frenzy. You and Gooigi have to work together to throw bombs back into his mouth. If you miss the timing, he resets the phase, and it’s frustrating as heck.
Actionable Tips for a Perfect Run
If you want to 100% this game, you need to be meticulous. Money is everywhere, but it’s mostly used for buying "Gold Bones" (lives) and finders for gems/Boos in E. Gadd’s shop.
- Check every vent: If a room looks empty, there is almost certainly a vent hidden behind a plant or a rug.
- The elevator is your hub: You'll be back and forth a lot. Use the map to see which floors still have "grayed out" rooms. That means you haven't stepped foot in them.
- Listen to Polterpup: The dog isn't just a gimmick. He often barks at walls or objects that contain hidden items or progress-sensitive keys.
- Don't hoard your money: Buy the Boo Finders early. Tracking them down manually is a nightmare because they move between rooms if you fail to catch them.
The beauty of a Luigi's Mansion 3 walkthrough is that while the path is linear, the discovery is totally up to you. You can finish the game in about 12 hours if you rush, but you’ll miss the charm of the world. Take your time to vacuum the curtains. Pull the tassels on the rugs. Every floor is a playground of physics, and half the fun is just seeing what breaks when you hit it with a plunger.
To wrap this up, prioritize upgrading your awareness of the environment over your combat skills. Combat is simple once you realize you can slam ghosts into each other. The real challenge is the "environmental storytelling"—looking at a room and figuring out why a painting is crooked or why a certain statue is missing a hand. That is where the real treasure is hidden.
Now, get back into that elevator. You've got a lot of ghosts to bust and a brother to save. Keep your flashlight charged and your Gooigi ready to melt at a moment's notice. You'll need it.