Professor Puzzle presents The Einstein E=Mc² Puzzle Cubes Puzzle - A fun Wooden Puzzle Game suitable for both kids & adults. Includes 4 solid wood cubes & hours of fun. Can you arrange the cubes so that Einsteins famous equation is shown on all 4 sides? A unique wooden puzzle. Exercise visual perception and orientation skills. Part of the official Albert Einstein collection - A suite of complex 3D Puzzle / Brain Games.