Epic Paper Mario is a fan-made recreation of Mario Paper with keyboard and game controller support.

Here's the official storyline:

Something strange is happening in the Mushroom Kingdom! Things haven’t been the same since Captain Toad went missing in the Rattle Bone Ruins. It seems he discovered a treasure that was better left buried. Now, weird monsters are showing up throughout the once peaceful kingdom and are causing chaos. Even the hero Mario can’t solve this crisis alone. The tide seems to turn with the timely arrival of Toadzen, an old friend of Toadsworth, who also leads an organized team of warriors known as the Funguerros. With their help, will Mario be able to discover the cause of the trouble and save the Mushroom Kingdom once more? No matter what happens, it’s going to be one Epic Paper Mario!

Features:

Side-Scrolling Platformer / RPG Hybrid – Unlike Super Paper Mario, this game will continue the tradition of having turn-based battles. However, there will be enemies that can be defeated on the field without going into battle. This allows for a better balance to be struck between the RPG and platformer mechanics.

It’s Better With Badges! -Badges can augment a character’s abilities, teach them new skills, or give certain boosts. Unlike Paper Mario and Starlite Worlds, there are no “partner” badges. Instead, every character can equip any badge other than the ones that teach unique skills.

Partner Up! - Throughout the game, several characters will join Mario’s team, each with their own unique story and abilities. Using those abilities both in and outside of battle will be key to making progress.

Suit Up! -Returning from Seven Sages, suits will play a major role in the game. Now, instead of only affecting the wearer in battle, they will affect the wearer on the field in addition to battle. For instance, using the Frost Core will allow Mario to transform into Frost Mario. This gives him access to new moves in battle. Outside of battle, this allows him to double jump and run on water. Mario’s clothes will change to those of the suit both inside and out of battle, unlike Seven Sages.

Level Up! -Mario and his partners will level up as they gain Star Points from battle. For the first time in Paper Mario, partners will have their own level and Star Points. All partners will gain Star Points from battle, but the partner being used at the end of the battle will get slightly more.