Gear Cube EXTREME Rotational Puzzle _ White Gear Cube Extreme is a Rotational (Twist and Turn) style Brain Teaser Puzzle By twisting and turning the geared pieces on each it is very easy to mix-up the puzzle. The object is to return each side of the cube to a single color. The mechanism design of this puzzle makes it much more interesting than a standard rubik's cube. Smooth, easy rotation.