Gear Cube Black _ Meffert's Exceptional Twisty Rotational Style Puzzle _ Bonus Twisted Nails Puzzle Mix up the puzzle by twisting and turning left to right, up and down and side to side. Objective is to return each side to a single color. (Similar to a Rubik's Cube) Fascinating movements. Gears actually turn on the surface of the puzzle. BONUS: Twisted Nails Puzzle. Separate and then rejoin the 2 carpenter's metal nails. Measures approximately 2.25 inches cube. Smooth turning puzzle.