Sudoku A Game of Mathematicians 640 Puzzles Medium to Hard Difficulty

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Featuring 640 medium to hard Sudoku puzzles, this book offers hours of engaging entertainment and a fun way to enhance problem-solving skills. Ideal for passing time during dull moments, whether waiting or stuck indoors due to weather, it transforms boredom into a relaxing challenge. This collection serves not only as a source of enjoyment but also as a tool for keeping your mind sharp, making it a thoughtful gift for puzzle enthusiasts.