This is a walkthrough for all gems in D3 Across the Chasm, as well as how to clear the level and find the boo in Luigi's Mansion 2 HD for the Nintendo Switch. Read on for a detailed guide for D-3 Across the Chasm, including how to get 3 stars, gem locations, location of the boo, as well as the secret door location.

Previous Mansion					Current Mansion					Next Mansion
Old Clockworks					Secret Mine					Treacherous Mansion
D-1			D-2			D-3			D-Boss			D-Bonus

D-3 Across the Chasm Gems and Boo Location Map

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Map	Guide	Gems
Boo	Secret Door	Enemies

These are all of the Gems available within this Mansion, however some Gems are exclusive to specific Missions.

Interactive Map of All Mansions

D-3 Across the Chasm Walkthrough

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Map	Guide	Gems
Boo	Secret Door	Enemies

D-3 Across the Chasm How to Get 3-Stars

Min. Clear Time	Min. Ghosts Captured	Max. Health Lost	Min. Treasure
22:35	13	20 or Less	2100

These numbers are values we got based on our runs. If you got 3-Stars with better scores, take pride in it and share a picture in our Missions Record Boards!

D-3 Across the Chasm Objectives

Goal	Find the access to the gondola in the Terminal. Board it, and cross the chasm to reach the location of the Dark Moon piece. Remove the paranormal chains that block the door to the gondola. Capture each ghostly culprit to vanish each chain. Find another way to cross the chasm. Reach the Workshop, and look for the Dark Moon piece.
Description	Success! The Parascope has located both the Dark Moon piece and the possessor that has it. But you'll have to cross the chasm and reach the other side to find them!

1. Find the Gondola Access
2. Get Rid of Paranormal Chains
3. Cross the Chasm and Reach the Workshop

Find the Gondola Access

First, you must unfreeze the elevator. To do this, enter the fireplace to go up to the area of the room where there's an open window with snow coming through. Close the window then turn the valve to have the bottom part of the chandelier touch the top part so that it gets lit in flames. Lower it to melt the ice off the frozen elevator.

Return to the fireplace then enter the elevator, which will lead you to the Airway. From there, go left and turn on the machine. Suck up a chain then ride over to the Terminal's entrance. Go through the hallway then use the strobe light when you get to the wall with reflective ice. This will set off one of the bombs stuck in the ice.

The first bomb will destroy a piece of ice and reveal another bomb. Destroy the pieces of ice then go through the newly revealed door.

Get Rid of Paranormal Chains

A Strong Gobber, Strong Slammer, and Strong Greenie will appear, which you will need to find and defeat to be rid of the Paranormal Chains.

From the Terminal, go south through Prospector's Crossing and go into Drift Hall. Go west to the Basin. Once there, use your Dark-Light Device to reveal a bomb in front of the glass. Have it blow up to reveal the Strong Gobber. Defeat it, as well as the two Hiders to undo the yellow chain.

Leave through the Airway on the west side and go into Skip Slope. Slide down and find the missing door at the bottom using your Dark-Light Device. At Smuggler's Hideout, try to melt the big ice block that's blocking the door. The Strong Greenie will appear with three Sneakers. Defeat them to undo the green chain, then shut the window, and then melt the ice.

Ride the Shaft down to the bottom and go into the Coward's Chambers. Go behind the reflective ice, and then enter the door into the Deep Hall where you will encounter the Boo, Paraboola when you uncover the missing pot over the fire.

Enter the Crystal Quarry and go through the portal which will get you to the Chalet. Here, you will be attacked by the Strong Slammer with three Greenies. Defeat them all to undo the red chain at the Terminal. Find your way bacck to the terminal and go through the unlocked door leading to the High Wires.

Cross the Chasm and Reach the Workshop

Use the flaming nut shooter to melt the ice to allow Luigi to use the Gondola. Return to the Terminal and go through the door on the right to go to High Wires. Grab onto one of the chains to get to the next platform. Go to the Workshop Landing using the next set of chains. Enter the door on the right, leading to the Maintenance Room.

Remove the ice that's blocking the generator by blasting bombs from the conveyer belt into the three slots seen above.

Remember to detonate each bomb with a flash after you throw it in, in this order: Left, Middle, Left, Right, Right, Middle.

Once the generator is working, go to the door on the left side. It will get snowed in, and E. Gadd will teleport you back to the bunker.

D-3 Across the Chasm Gem Locations

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Map	Guide	Gems
Boo	Secret Door	Enemies

Available Gems
#1					#2					#3					#4
#5					#6					#7					#8
#9				#10				#11				#12				#13

Grayed out Gems are unavailable on this mission.

Gem #1 (Circle Sapphire)

Gem	Circle Sapphire
Where to Find	Smokehouse

Head into the Smokehouse, defeat all the enemies inside, use the Dark-Light Device to reveal a coat hanging on the north wall by the door, pull it down, and a Circle Sapphire will drop.

Gem #2 (Triangle Sapphire)

Gem	Triangle Sapphire
Where to Find	Fishing Hut

Head towards the Fishing Hut after the cutscene with the Boo, suck up the snow by the entrance on the left, and you will obtain a Triangle Sapphire.

Gem #4 (Football Sapphire)

Gem	Football Sapphire
Where to Find	High Wires

Head to the High Wires, use the Poltergust to swing onto the platform with a nest on the west wall, use the Strobulb to scare the birds, and use the Poltergust again to suck the Football Sapphire.

Gem #5 (Drop Sapphire)

Gem	Drop Sapphire
Where to Find	Airway

Head to the Airway via the Terminal and use the telescope to see that the gem was dropped into a barrel by a bat. Head to the Airway via the Basin, go across the rope bridge, and interact with the barrel on the other side to obtain the Drop Sapphire.

Gem #6 (Stone Sapphire)

Gem	Stone Sapphire
Where to Find	Chalet Approach

Head out to Chalet Approach, use your Poltergust to get the flaming turkey on top of the grill in the west, use it on the frozen painting just down the stairs on the east, and use the Dark-Light Device on the painting to obtain the Stone Sapphire.

Gem #7 (Rhombus Sapphire)

Gem	Rhombus Sapphire
Where to Find	Prospector's Crossing

Head into Prospector's Crossing, use the Dark-Light Device to reveal a hidden pickaxe near the hanging lantern, use the Poltergust on the pickaxe to reveal hidden blocks of wood behind the wall, and use the wooden blocks to break the ice where the Rhombus Sapphire is stuck.

Gem #8 (Star Sapphire)

Gem	Star Sapphire
Where to Find	Skip Slope

Slide down the Skip Slope, head towards the left side, and try to grab the Star Sapphire as you're sliding down.

Gem #9 (Octagon Sapphire)

Gem	Octagon Sapphire
Where to Find	Shaft

Head down the Shaft by using the Poltergust to turn the gear on the lift, once you reach the bottom, pull the chain, then head up until you see a hole containing the Octagon Sapphire.

Gem #10 (Oval Sapphire)

Gem	Oval Sapphire
Where to Find	Deep Hall

After you have transported some rocks from Pit Mine, use the Poltergust on the rocks and set it on fire in the fire pit, then aim the flaming rock on the ceiling just above the fire pit, and the Oval Sapphire will drop.

Gem #11 (Spindle Sapphire)

Gem	Spindle Sapphire
Where to Find	Crossroads

Head into Crossroads, go through the portal, use the Dark-Light Device to reveal the drawer opposite the door, and suck up all the snow to obtain the Spindle Sapphire.

Gem #12 (Coffin Sapphire)

Gem	Coffin Sapphire
Where to Find	Crystal Quarry E-Gate

Head into Crystal Quarry, use the Strobulb to open the portal, and once you go through the portal, it will lead you to the Chalet along with the Coffin Sapphire.

Gem #13 (Mushroom Sapphire)

Gem	Mushroom Sapphire
Where to Find	High Wires

After you melt down the frozen swings in the Gondola, head towards High Wires. Use the Poltergust to reach the platform on the west, then go across the fallen tree to the north until you reach a door with a crescent moon symbol. After entering the door, complete the time challenge, and you will receive the Mushroom Sapphire as a reward.

Gem Locations: How to Find All Gems

D-3 Across the Chasm Boo Location

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Map	Guide	Gems
Boo	Secret Door	Enemies

ParaBoola Location

Boo	Where to Find
ParaBoola	Deep Hall

Enter the deep hall, use the Dark-Light Device on the fire pit where a tea kettle originally was, suck up all the spirit balls, and push the kettle above the fire to reveal the Boo.

All Boo Locations: Where to Find All Boos

D-3 Across the Chasm Secret Door

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Map	Guide	Gems
Boo	Secret Door	Enemies

Location	How to Find the Secret Door
High Wires	Make your way across the toppled tree to find the outhouse hidden on a small ledge.

How to Beat the Challenge

Vacuum snowballs on the ground, and wait for a Hider to pop up from behind the wall. Each time a Hider shows itself, it does one of two things. If the Hider attacks, dodge the incoming snowball and wait for the next Hider to appear. If the Hider taunts you, shoot it with the snowball as soon as you see the targeting reticle.

All Secret Door Locations and Rewards

D-3 Across the Chasm Enemies

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Map	Guide	Gems
Boo	Secret Door	Enemies

Enemies Encountered in D-3 Across the Chasm

Greenie	Hider	Sneaker
Strong Greenie	Strong Slammer	Strong Gobber
Gold Greenie	Mouse	Gold Mouse
Spider	Gold Spider	Bat
Gold Bat	Crow	Gold Crow
Beetle	Fuzzball	Gold Fuzzball

Luigi's Mansion 2: Dark Moon Related Guides

All Mansions and Stages

All Mission Guides

Gloomy Manor
A-1		A-2		A-3
A-4		A-5		Boss
Bonus Mission
Haunted Towers
B-1		B-2		B-3
B-4		B-5		Boss
Bonus Mission
Old Clockworks
C-1		C-2		C-3
C-4		C-5		Boss
Bonus Mission
Secret Mine
D-1		D-2		D-3
Boss			Bonus
Treacherous Mansion
E-1		E-2		E-3
E-4		E-5		Boss
Bonus Mission
King Boo's Illusion
A Nightmare to Remember

Post-Game

Post-Game Guide
ScareScraper Guide	Ending and Post-Game Content	100% Checklist

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