Cube in a Cube in a Cube

18 moves

Three cubes nested in the same corner, one inside the next.

Start from a solved cube. On a scrambled one these turns make nothing but a mess.

Run the same algorithm 3 times in total and the cube is solved again.

Each letter is one face, turned a quarter turn clockwise as you look straight at it. An apostrophe means anticlockwise, and 2 means a half turn.