The Mushroom World Moon is the planet's moon that orbits around it. It is where the location of the X-naut base is. There is less gravity here than on the Mushroom World. Mario's movement is even slowed down. The stars in the sky can form constellations that look like power-ups such as the Fire Flower and Super Mushroom. The moon is only accesible in Paper Mario: The Thousand Year Door, where the X-Naut' Fortress is based in.