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http://www.amazon.com/Mathematical-Puzzles-Connoisseurs-Peter-Winkler-ebook/dp/B004C05A18/ref=mt_kindle?_encoding=UTF8&me=
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This collection includes more than 100 of the best (and some of the toughest)mathematical puzzles ever to appear in one volume.
You'll need a love for mathematical reasoning and a streak of determination. You won't need a professional acquaintance with mathematics; a motivated high school student has what it takes! If you're up to the challenge, there's even a chapter on Unsolved Puzzles.
