Puck puzzle

The puck puzzle, also called the picture disc and known in Hungarian as Kep Korong, is a combination puzzle invented in 1980 by the Hungarian physicist Andras Vegh. The puzzle is disc shaped and built from two main moving parts: a central disc split into two halves, and a surrounding ring divided into an even number of outer segments, commonly six, eight or twelve pieces depending on the specific model. The outer ring can be turned like a wheel around the central axis, and the two halves of the central disc can also be rotated together along with whichever ring segments currently sit next to them, so a solver alters the puzzle's arrangement by combining ring turns with central disc turns. Depending on the particular version produced, the goal is either to reassemble a picture that has been scrambled across the disc and ring segments, or to put a sequence of numbers back into their correct order around the puzzle, using the two rotational operations to cycle pieces into place the way a solver would on other combination puzzles such as the Rubik's Cube.