This is such an interesting puzzle! Looks like anyone should be able to solve it minutes, since its only 5 pieces. Yet, it is SO much more difficult than it first appears! My wife, reasonably good at puzzles, worked on it for hours and finally gave up.... It makes a fantastic desk or coffee table puzzle as people will want to try it and tend to get pulled into the puzzle, not wanting to give up. You can attempt it in seconds and always seem to get close.... The pieces are made from various woods, nicely finished on both sides. They are 1/4" thick so are nice durable and have a great feel. There will be at least 3 different woods used. I made a frame from floorboard material with a home for the 5th pieces on the side, such that is comes unsolved as shown in the photo. Measures about 5" x 4" in the frame. It comes with the solution, but try not to look! The design is documented as #177A by Stewart Coffin. Level of Difficulty: Level 5