Mensa's Most Difficult Number Puzzles av Dr. Gareth Moore, Mensa Ltd

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<p><b>Prove your logical and arithmetical prowess by solving the exceptionally tricky problems in Mensa''s Most Difficult Number Puzzles. </b><br><br>This full-colour book features a huge variety of numerical conundrums that are certain to test even the most adept of puzzlers. Some puzzles ¿ such as sum skyscraper and calcudoku ¿ will test your mental maths, while others ¿ such as touchy and bridges ¿ will provide a trial for your logical and lateral thinking. Are you up to the fiendish challenge?</p>