Mefferts Gearcube Brainteaser Puzzle Hold the ball with both hands and twist in opposite directions. As the gears move, the colors change on each facing as well as the black frame. Solve by framing 6 sides, each with a solid color. A challenging brain teaser puzzle for adults and children alike! Display on your nightstand, shelf, or living room as a decorative conversation piece. The perfect gift for the puzzle enthusiast in your life!