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Question & Answers
Answer from: luvby
You have to go to world 3-6. There is a shop where you can by those door stickers.
Answer from: Tails
I'm guessing that you found those door outlines. To open them, you need to go to Outlook Point (World 3-6). There will be a shop selling Secret Door Stickers. There are two uses for them.
1) In battle, Secret Door Stickers are helpful for an instant getaway. Use it if you don't want to fight.
2) When you see one of the door outlines, paperise and stick a Secret Door Sticker over it. You can now open the door!
Note: Secret Door Stickers are medium-sized (six of them = one page).
Answer from: Notch
Hey you need to go to 3-6 there's a shop with those stickers
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