Rubickian Prison Boxes is a type of enchanted object which exists in the 2017 Continuum.
Description[]
A Rubickian Prison Box is a cube which can be used to imprison powerful demons. It resembles an ordinary Rubik's Cube toy, and, if solved like a Rubik's Cube, will release the demon contained within it. Rubickian Prison Cubes presumably originated on the Rubickian Puzzle Planet in the Yonder Galaxy.
Behind the scenes[]
Rubickian Prison Boxes were first mentioned by Frank Angones on his Suspenders of Disbelief blog. According to Angones, if Webby were to find a Rubickian Prison Cube and realize what it was, she would solve it anyway.[1] They are presumably meant to be a reference to the Rubickian Puzzle Planet, mentioned in the Wander Over Yonder episode The Rider.