The "Puzzle Palace" is the name of the shop in George Miller's back yard where he crafts puzzles of fantastic quality, both in the workmanship and in their puzzling nature. Pay attention to the descriptions of each puzzle on his web site. He accurately describes the puzzle and, though it's nice to own some of these as works of art and puzzle history, it's good to know if the puzzles you're getting are easy, challenging, or ones that can't be solved by humans. These puzzles are not cheap, but given the craftmanship that goes into them and their uniqueness, they are worth it. I own seven of George Miller's puzzles and value each one. Caution: many of these puzzles are not suitable for children.