Mysterious book

The Paper Mario book is a key plot element in Mario & Luigi: Paper Jam. It is a mystical book that contains a paper world.

While searching for the source of a draft in the attic of Princess Peach's Castle, Luigi and a Toad discovered the book on the bookshelf. Startled by a Scaredy Rat, Luigi knocked the book down, causing it to open and release various Paper characters into the world. Mario and Luigi teamed up with Paper Mario to track down the various Paper Toads that had been released, while Bowser united with Paper Bowser.

After making their way through Doop Doop Dunes, the Marios and Luigi lost the book to Bowser Jr. and Paper Bowser Jr., who intended to destroy it so they could stay together, but ultimately decided to keep it. Bowser and Paper Bowser discovered the book themselves, and intended to trap the Mario Bros. in the book and then destroy it.

After the final battle with Shiny RoboBowser, Mario, Luigi, and Paper Mario trapped Paper Bowser back in the book, and ultimately used the book to return all of the Paper characters and Paper terrain back to their own world.