Shake off the Boos in Creepy Steeple several times to fight Atomic Boo in Paper Mario: The Thousand-Year Door (TTYD). Read on to learn more about this boss, its stats, and how to beat it!

How to Fight Atomic Boo

Shake Off Boos in Creepy Steeple

1.	At the entrance hall room in Creepy Steeple, push the star statue to reveal a secret hole. After going down the hole, go through the door on the left, then open the chest at the center of the room.
2.	Once opened, 200 Boos will come out of it and the last Boo will ask you a question. If you answer 200 Boos, will get an Ultra Shroom as a reward.
3.	Afterwards, use the spring in the room on the right to come back up in the entrance hall.
4.	Talk to Atomic Boo in the entrance hall and choose No Bullying.
5.	Spin your Hammer to shake off the Boos several times, and then you will enter the battle with Atomic Boo.

Creepy Steeple Collectibles, Enemies, and Points of Interest

Get a Lucky Start Badge as a Reward

Upon defeating Atomic Boo, the big ghost will drop a Lucky Start badge as a reward.

List of Badges in Paper Mario TTYD

How to Beat Atomic Boo

1. Get Vivian First
2. Hide From Boo's Powerful Attack with Vivian's Veil
3. Use Power Lift to Increase Attack and Defense Powers

Get Vivian First

It is highly recommended to have Vivian join your party first before fighting Atomic Boo. Atomic Boo is also weak to fire moves, so Vivian's Shade Fist and Fiery Jinx moves are actually very effective against the big ghost.

Note that Vivian will join your party while progressing through Chapter 4.

Hide From Boo's Powerful Attack with Vivian's Veil

The moment Atomic Boo hides its face, the big ghost will unleash a powerful attack the next turn, which can be avoided by using Vivian's Veil move to hide in the shadows.

Use Power Lift to Increase Attack and Defense Powers

You can use the Power Lift special move to increase your attack and defense powers to reduce the damage from Atomic Boo's attacks. Once your attack power is increased, use Power Bounce to deal high amounts of damage.

Atomic Boo Details and Stats

Tattle Log No. 75
Atomic Boo
Description	A massive creature made up of countless Boos. It attacks by breaking apart and sending out hundreds of Boos.
Type	Secret Boss

All Enemies in Paper Mario TTYD

Stats

Move Resistances

Move Resistances
Jump	Hammer	Showstopper
Gulp	Gale Force	Kiss Thief

Status Effect Resistances

Status Effect Resistances
Burn				Freeze				Dizzy				Confuse				Sleep
Soft					Shrink					Fright Mask					Time Stop

Paper Mario: The Thousand-Year Door Related Guides

All Bosses

All Bosses

Paper Mario TTYD Bosses
Chapter Bosses	Mini Bosses	Secret Bosses

Secret Boss List

All Bosses
Atomic Boo	Bonetail	Gus	Prince Mush
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