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The Mathemagician and Pied Puzzler. A Collection in Tribute to Martin Gardner. Martin Gardner = Mint! Ambrose, Gardner, and Doyle. Creative Puzzle Thinking. Twice: A Sliding Block Puzzle. Beautiful but Wrong: The Floating Hourglass Puzzle.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.