Paper Mario Sticker Star: Secret Blue Door Walkthrough

Anyone can work on this. But please avoid spoilers if possible and remember, this is secret doors only!

As this is level 1, the door is simple to find. Simply walk to the third section of the level, and head right. It will be right on the edge of a wall you pass. Be careful to look for the faint outline and not to miss it, then use your 80 Coin Door Sticker.
Inside you will find the Thumbtack Thing.

I already found all the Blue doors, finding the Green doors is a bigger challenge!