Reno Puzzle Company produces award-winning brain-stimulating puzzles called AQube. The original AQube puzzle is four layers of interlocking pieces. Find the corners, edges and sides and solve the cube. It has a difficulty level of "Pull Your Hair Out" (level 3). AQube now come in a variety of colors and pin/block configurations. Each puzzle has a different level of difficulty - The Thinker, Deep Thought, Pull Your Hair Out, and Mind Blowing. Collect the whole set.