Objective:

Set all 18 clock faces to 12 o'clock in the shortest time or the fewest moves.

How to play:

There are 9 clocks on each side of the puzzle. Turn the corners of the puzzle clockwise or anti-clockwise to move the clocks. Use the four yellow pegs to stop different clocks moving and control the way the game behaves.

Once you’ve solved one side, flip the puzzle and try to solve the other. You’ll find that changes to one side affect the other, but not in the way you might expect.