Puzzles
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Codes, Ciphers and Secret Writing
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Cryptanalysis (A Study of Ciphers and Their Solution)
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Jumble® Circus (A Three-Ring Puzzle Extravaganza!)
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My Best Mathematical and Logic Puzzles
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Tangrams (330 Puzzles)
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The Liar Paradox and the Towers of Hanoi (The 10 Greatest Math Puzzles of All Time)
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The Master Book of Mathematical Recreations
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