User:Green Star/sandbox

Story
The story begins with a Toad entering the attic of Peach's Castle, looking for the source of a draught. Luigi appears and agrees to help him. They find a mysterious hole in the wall, which the Toad suspects to contain the draught. Luigi begins to investigate but is startled by a Scaredy Rat, which causes him to fall off the bookshelf. Luigi then sneezes and slams backward into the bookshelf, causing a book to fall off its shelf and open. Suddenly, all the Paper characters within are released and spread them throughout the Mushroom Kingdom. Paper Toads are seen landing near Toad Villages, while Bowser's minions begin to encounter their paper counterparts.

Paper Peach, however, remains at the castle and is taken to Princess Peach. As the princesses, Luigi, Mario, and Starlow begin to figure out what happened, a Toad rushes in, announcing the unexpected arrival of the Paper characters. Mario and Luigi help find Paper Toads, which are hiding in the lobby. After being rescued, they reveal that all the other Paper Toads they were with were captured by Bowser's minions, but they were able to escape. Paper Peach then realizes that the Bowser from her world might now in their world, along with all of his minions; however, this means that the Mario from her world might have also been transported to their world. Mario, Luigi, and Starlow then set off on yet another adventure.

Before leaving the castle, they have a run-in with Nabbit, who has stolen several Bros. Attacks from a group of Toads, leaving Mario and Luigi with only two to use during battle. They also run into Toadette, who mentions her plans to build a life-size Papercraft for the bros. and wishes them good luck. They are also given a Copy Block by some Paper Toads, who team up with Toadette for their next project. They finally begin to explore Sunbeam Plains, where they are immediately confronted by two Paper Goombas. After they are defeated, they run away, vowing to return.

Meanwhile, in Bowser's Castle, Kamek is giving an unsatisfactory status report to Bowser. Just then, Paper Bowser appears, confused about where he is. He and Bowser quickly get into a feud, each arguing that they are the true Bowser. Bowser Jr. and Paper Bowser Jr. are also introduced to each other, and after some bickering, they quickly form a connection.

Shortly after, Mario and Luigi are cornered by a large group of Paper Goombas. They turn into a wheel which quickly defeats Mario and Luigi. They prepare to leave to tell Bowser the good news, but are stopped by Paper Mario, who flutters down from the sky. They attempt to defeat him but are defeated themselves, and the Crinkle Goomba runs away, promising to return once again. Paper Mario officially joins them on their quest for the rest of the game.

After venturing further into the plains, they receive a delivery from a Paper Toad that had been rescued at Peach's Castle, which contains their first Trio Attack. Later after that, another Toad arrives to inform them that the castle had been invaded by both Bowsers, and that the princesses had been kidnapped again. At that moment, Bowser and Paper Bowser arrive in their Koopa Clown Cars with the princesses. They inform the trio that they have decided to set aside their differences to work together in order to achieve their shared goal of kidnapping the princess. Bowser attempts to further slow them down by summoning Petey Piranha out of the ground. After he is defeated, the trio is able to continue onward.

Just as the three brothers are about to leave Sunbeam Plains, they are hindered by Paper Kamek and a group of Goombas, who block the exit with a large Papercraft Goomba. Toadette appears and is inspired to make a bigger, better papercraft, requesting a number of Paper Toads to do the job. The trio is able to find them at a nearby Toad Village, and transport them to the castle with the help of Lakitu. They head back to the papercraft just as when the Goombas return, attempting to squish them. Fortunately, Toadette shows up with her first papercraft, which they use to defeat the papercrafts.

After entering Doop Doop Dunes, they spot Bowser's Castle in the distance, where several minions and paper minions are seen rallying. Meanwhile, Bowser Jr. and his paper counterpart complain about being bored, and plan to find and destory the book so that they will not have to be separated. While they are distracted, Peach and Paper Peach plan their way out. Paper Peach discovers she is able to slip through the bars of the cage, which gives them an idea.

Meanwhile, Mario, Luigi, and Paper Mario spot Nabbit nearby and chase after him in an effort to recover Bros. Attacks as well as their hammers, which he had stolen. They manage to recover one Bros. Attack, Rocket Blast, and attempt to recover more, but are stopped by two Pokeys. After learning a new Trio Move, Trio Hammer, they attempt to cross a bridge, but are prevented from doing so by the Tower Power Pokeys, who cause them to fall off and land in the Doop Doop Dunes Grotto.