Gear Ball _ Rotational Style Brain Teaser 6 sided "rubik's style" twist and turn brain teaser Mix up all the colors by turning halves of puzzle. Objective is to return all same color to each side. Sides can rotate along all three axis. Mefferts square piece must be in center to switch to a different axis rotation. Measures approximately 3 inches square. Very cool gear like movement along the surface as puzzle is turned.