5 pieces in a case 3 layers will not fit No protruding from the case, when inserted snugly and clear. This is the 1st award winning puzzle audition held by the Japan Puzzle Association. Judge evaluation comments: "This puzzle is a simple and easy to understand puzzle that will fit all 5 types of rectangle pieces in the case. But its the answer to novel ways that you cant expect easily. This is a very well made puzzle that will be impressed with the surprise and joy of the completed and the beauty of the encompassing. "