Rubik's Clock is a puzzle with 9 clocks, each of which has a front (represented by the black hour hand) and back (represented by the pink hour hand). The goal is to make the front and back of all clocks point to 12 o'clock at the same time. This is accomplished by rotating the corner clocks and setting the yellow quadrant buttons, which affects what other clocks are rotated when each corner clock is rotated. The position of each clock and quadrant button is remembered when the app is closed, and you can also generate a solution with the steps to solve the puzzle.