Defeat Big Boo in Paper Mario: Sticker Star

Q: What stickers to buy at Shaved Ice Cave?

Collect the [Cake] and [Shiny Hopslipper]. Backtrack, go right, and examine the portrait to fight a Boo. Go through the middle door, place the portrait, hammer the trash can for a 1 HP Boo, and defeat the Boo by the portrait. Go left, open the cabinet for a Boo Stack battle (use Infinijump), grab the [Big Bookcase] scrap, hammer the clock for another Boo. Talk to the Purple Toad, hammer the fire, defeat the Boo. Go to the easternmost room, Paperize the Bookcase to reveal a hidden room, peel Bowser tape, go downstairs, place the book, and face Kamek. Prepare with Spike Helmets or Fans. After the battle, return west, sit on the chair, check the painting for the [Forebear's Portrait] scrap, and exit the level. Then, visit Shaved Ice Cave for new stickers.

Q: How to beat the Big Boo in Paper Mario: Sticker Star?

Collect the [Cake] and [Shiny Hopslipper]. Backtrack, go right, and examine the portrait to fight a Boo. Go through the middle door, place the portrait, hammer the trash can for a 1 HP Boo, and defeat the Boo by the portrait. Go left, open the cabinet for a Boo Stack battle (use Infinijump), grab the [Big Bookcase] scrap, hammer the clock for another Boo. Talk to the Purple Toad, hammer the fire, defeat the Boo. Go to the easternmost room, Paperize the Bookcase to reveal a hidden room, peel Bowser tape, go downstairs, place the book, and face Kamek. Prepare with Spike Helmets or Fans. After the battle, return west, sit on the chair, check the painting for the [Forebear's Portrait] scrap, and exit the level. Then, visit Shaved Ice Cave for new stickers.

Q: Where to find the Forebear's Portrait scrap?

Collect the [Cake] and [Shiny Hopslipper]. Backtrack, go right, and examine the portrait to fight a Boo. Go through the middle door, place the portrait, hammer the trash can for a 1 HP Boo, and defeat the Boo by the portrait. Go left, open the cabinet for a Boo Stack battle (use Infinijump), grab the [Big Bookcase] scrap, hammer the clock for another Boo. Talk to the Purple Toad, hammer the fire, defeat the Boo. Go to the easternmost room, Paperize the Bookcase to reveal a hidden room, peel Bowser tape, go downstairs, place the book, and face Kamek. Prepare with Spike Helmets or Fans. After the battle, return west, sit on the chair, check the painting for the [Forebear's Portrait] scrap, and exit the level. Then, visit Shaved Ice Cave for new stickers.

Q: How to defeat Boo Stack in Paper Mario: Sticker Star?

Collect the [Cake] and [Shiny Hopslipper]. Backtrack, go right, and examine the portrait to fight a Boo. Go through the middle door, place the portrait, hammer the trash can for a 1 HP Boo, and defeat the Boo by the portrait. Go left, open the cabinet for a Boo Stack battle (use Infinijump), grab the [Big Bookcase] scrap, hammer the clock for another Boo. Talk to the Purple Toad, hammer the fire, defeat the Boo. Go to the easternmost room, Paperize the Bookcase to reveal a hidden room, peel Bowser tape, go downstairs, place the book, and face Kamek. Prepare with Spike Helmets or Fans. After the battle, return west, sit on the chair, check the painting for the [Forebear's Portrait] scrap, and exit the level. Then, visit Shaved Ice Cave for new stickers.

Q: What is the reward for beating Big Boo?

Collect the [Cake] and [Shiny Hopslipper]. Backtrack, go right, and examine the portrait to fight a Boo. Go through the middle door, place the portrait, hammer the trash can for a 1 HP Boo, and defeat the Boo by the portrait. Go left, open the cabinet for a Boo Stack battle (use Infinijump), grab the [Big Bookcase] scrap, hammer the clock for another Boo. Talk to the Purple Toad, hammer the fire, defeat the Boo. Go to the easternmost room, Paperize the Bookcase to reveal a hidden room, peel Bowser tape, go downstairs, place the book, and face Kamek. Prepare with Spike Helmets or Fans. After the battle, return west, sit on the chair, check the painting for the [Forebear's Portrait] scrap, and exit the level. Then, visit Shaved Ice Cave for new stickers.

AntMag.NET

Walkthrough

1
From the start, pick up the [Cake] from the center and jump on the blue flower for a [Shiny Hopslipper].
2
Backtrack upstairs.
3
Go right and through the door.
4
Examine the portrait to start a battle. A Shiny Shell is recommended.
5
Go back out and through the middle door.
6
Place the portrait on the wall.
7
Hammer the trash can to fight a Boo with 1 HP.
8
Head to the front of the room (don't exit).
9
Look at the portrait.
10
Defeat the Boo by walking up to it.
11
Leave the room and go through the left door.
12
Open the cabinet to battle the Boo Stack. Use Infinijump to defeat all eighty-eight Boos.
13
Pick up the [Big Bookcase] scrap from the door.
14
Watch the clock. Wait for it to swing violently, then approach, hammer it, and battle the resulting Boo.
15
Go talk to the Purple Toad outside.
16
Hammer the fire he made and defeat the Boo behind him.
17
Make your way back to the easternmost room on the lower floor (the one with furniture).
18
Paperize to place the [Big Bookcase] where it belongs. It will reveal a hidden room.
19
Peel off the Bowser tape to reveal stairs. Go down them.
20
Make your way to the next room and place the book on the pedestal.
21
Enter Kamek.
22
After the battle, return to the room west of the foyer.
23
Sit on the chair across from Steward.
24
Check the painting on the wall for a [Forebear's Portrait] scrap.
25
Look through the window and go outside to finish the level.

Boss Fight: Big Boo

HP: 100
Attack: 10
Defense: 0
Recommended Items: 5+ Spike Helmets or Fans. Go to Decalburg to buy them if needed.

Strategy:

On the first turn, use a Special on your Battle Spinner and use high-attack stickers like Big Shiny Jumps, Flashy Jumps, etc.
After the first turn, the lights will go out and the Big Boo will become invisible.
Block his attacks with a well-timed A button press when he comes down.
Use Spike Helmets to counteract his attacks until he is defeated. A Fan can also be used.
Ensure you have 5+ of these items in case the Big Boo has more than 40 HP remaining.

Shaved Ice Cave Sticker Shop:

This area is a shop selling various stickers: