This puzzle has only 12 pieces, but is extremely difficult because the pieces fit together in many ways, most of which will not lead to a solution. Designed and made by William Waite from solid hardwood, red alder and black walnut, the puzzle measures about 4" x 4". This is a tricky brain-teaser type puzzle good for ages 12 to adult. There is one solution engraved on the back so that you can always put it away if you get stuck. Based on an ancient infinite Arabic pattern.