Superflip

The superflip or 12-flip is a special configuration on a Rubik's Cube, in which all the edge and corner pieces are in the correct permutation, and the eight corners are correctly oriented, but all twelve edges are oriented incorrectly ("flipped").

By extension, this implies that a commutator of a superflip and any other algorithm will always bring the cube back to its solved position.

Contrary to popular belief, however, the superflip is not unique in this regard: there are many other positions that also require 20 moves.

Under the more restrictive QTM, the superflip requires at least 24 moves (the second algorithm above is one such sequence),[2][better source needed] and is not maximally distant from the solved state.

The last solution in the table is not optimal under any metric, but is both easiest to learn and fastest to do for humans, as the sequence of moves is very repetitive.