This is a walkthrough for all gems in C3 Roundhouse Brawl, 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 C-3 Roundhouse Brawl, 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
Haunted Towers							Old Clockworks							Secret Mine
C-1			C-2			C-3			C-4			C-5			C-Boss			C-Bonus

C-3 Roundhouse Brawl 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

C-3 Roundhouse Brawl Walkthrough

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Map	Guide	Gems
Boo	Secret Door	Enemies

C-3 Roundhouse Brawl How to Get 3-Stars

Min. Clear Time	Min. Ghosts Captured	Max. Health Lost	Min. Treasure
14:40	14	20 or Less	1800

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!

C-3 Roundhouse Brawl Objectives

Goal	E. Gadd has located the Ancient Poltergeist in the Roundhouse. Make your way there, and recover the clock hands that he took.
Description	The ancient ghost ran off with the clock hands we're looking for. Thankfully, his strong paranormal signature made him easy to find!

1. Find the Poltergeist in the Roundhouse
2. Recover the Clock Hands

Find the Poltergeist in the Roundhouse

Use the lift on the left side to take you to the upper level of the Warehouse. Enter the door into the Clockmaker's Chambers, but before you do so, suck up the rug and use the fan to change the time of the clock to 9:00. This will set off the alarm and wake up the Greenie. Defeat it and get the Rhombus Ruby.

While in Roundhouse, you'll be able to spot the Ancient Poltergeist on the lower level. Cross the beams to get to the other side and enter the door at the end of the hallway. The Transportation Hall contains a moving floor, which means you'll have to go through the other rooms to move through.

Enter the Finishing Room and use your Dark-Light Device to reveal a Greenie hiding behind a welding mask. After this, another Greenie will appear which you will have to defeat. Leave to through the next door.

At the Transportation Hall, walk across the door on the right side to get to the Container Yard. Beat the two Slammers there, then tug on the rope that dispences bombs. Put three bombs on the weight to bring it down the platform. Cross the platform, ignite the bombs, to let the next platform drop, which then reveals the next door.

Walk across the Transportation Hall and into the Kiln Room. Once inside, use the Dark-Light Device to reveal a hidden valve on the right. Turn both of the valves to defog the room, then flash your light on the green bulb to open the door.

Defeat the two Greenies and take care of the Boo that appears.

Recover the Clock Hands

Leave through the next door and return to the Transportation Hall. At the end of the hall, reveal a cog that will blast you past the gap. Use your Dark-Light Device to find a key, then go back through the hall.

Head down to the lower floor of the Roundhouse, go down a couple of stairs, then head west and use the Poltergust to suck the Octagon Ruby stuck up on the north wall.

Towards the end, you will find a locked door that leads to the lower level of the Roundhouse where you first saw the Ancient Poltergeist. Fight the Ancient Poltergeist while defending against bombs and Sneakers to obtain a clock hand.

C-3 Roundhouse Brawl 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 Ruby)

Gem	Circle Ruby
Where to Find	Clockworks Court

In Clockworks Court, head towards the east side, use the Dark-Light Device to reveal a toolbox at the end of the rail, and open the toolbox to obtain the Circle Ruby.

Gem #2 (Triangle Ruby)

Gem	Triangle Ruby
Where to Find	Warehouse

Enter the warehouse, use the Dark-Light Device to reveal a green barrel near the door on the north, place the barrel on the machine to unwrap its green wrap, and a Triangle Ruby will drop. The green barrel is on top of a box, on the right side of the door that leads to the Roundhouse.

Gem #3 (Rectangle Ruby)

Gem	Rectangle Ruby
Where to Find	Clock Tower Gate

Upon entering the Clock Tower Gate, head towards the north side by the broken window, use the Dark-Light Device to reveal a toolbox, and open it to obtain a Rectangle Ruby.

Gem #4 (Football Ruby)

Gem	Football Ruby
Where to Find	Storm Cellar

Head down to the Storm Cellar, defeat all the enemies, suck up the sheet that is covering the painting on the southwest corner, use the Dark-Light Device on the painting above the bed, and a Football Ruby will drop.

Gem #5 (Drop Ruby)

Gem	Drop Ruby
Where to Find	Canyon Stairs

Head to the Canyon Stairs, go up the platform on the east, and use the Poltergust to suck the Drop Ruby that is stuck up on the east wall.

Gem #7 (Rhombus Ruby)

Gem	Rhombus Ruby
Where to Find	Clockmaker's Chamber

Head up to the Clockmaker's Chambers, suck the carpet in the middle, use the Poltergust to blow some air until the clock on the wall reaches 9:00, and defeat the enemy holding the Rhombus Ruby to obtain the gem.

Gem #8 (Star Ruby)

Gem	Star Ruby
Where to Find	Roundhouse

After the cutscene, upon entering the Roundhouse, go across the railings on the left side to get to the north side. Then, go across the railings on the right side to get to the south side, head towards the south east, and open the toolbox at the very end of the balcony to obtain the Star Ruby.

Gem #9 (Octagon Ruby)

Gem	Octagon Ruby
Where to Find	Roundhouse

Head down to the lower floor of the Roundhouse, go down a couple of stairs, then head west and use the Poltergust to suck the Octagon Ruby stuck up on the north wall.

Gem Locations: How to Find All Gems

C-3 Roundhouse Brawl Boo Location

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Map	Guide	Gems
Boo	Secret Door	Enemies

Boodunkulous Location

Boo	Where to Find
Boodunkulous	Kiln Room

Enter the kiln room and defeat all the enemies inside. Then, the Boo will appear afterwards.

All Boo Locations: Where to Find All Boos

C-3 Roundhouse Brawl Secret Door

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Map	Guide	Gems
Boo	Secret Door	Enemies

Location	How to Find the Secret Door
Finishing Room	Head under the steps to find the area hidden behind the window. Vacuum the cloth from the window to reavel the room's northwest corner, then open the door on the north wall.

How to Beat the Challenge

When the challenge starts, head right and follow the trail of coins until you hit a wall, then make a hard left turn and follow the next trail. Work your way around the maze, saving the two Red Coins at the center for last.

All Secret Door Locations and Rewards

C-3 Roundhouse Brawl Enemies

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Map	Guide	Gems
Boo	Secret Door	Enemies

Enemies Encountered in C-3 Roundhouse Brawl

Greenie	Slammer	Sneaker
Ancient Poltergeist	Gold Greenie	Spider
Gold Spider	Bat	Gold Bat
Beetle

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

ScareScraper Records Board