Hedron

The Hedron is an obstacle in Super Paper Mario. It is encountered in the Outer Limits. The Hedron is an indestructible rotating blue rectangle with a yellow outline. If the player is hit by it, they take damage. They are often encountered in groups, requiring quick evasive maneuvers to avoid them. Flipping to 3D does not help, either; not only can Mario not move up and down, but the Hedron exists in the third dimension, as well.