{"product_id":"9781802791884","title":"Mensa's Most Difficult Number Puzzles : Prove your logical and numerical abilities against 200 fiendish problems by Mensa Ltd","description":"Prove your logical and arithmetical prowess by solving the exceptionally tricky problems in Mensa's Most Difficult Number Puzzles. 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?\u003cbr\u003eBinding: Paperback \/ softback","brand":"Gardners","offers":[{"title":"Default Title","offer_id":56307280183669,"sku":"9781802791884","price":16.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/7193\/3106\/files\/9781802791884.jpg?v=1762803401","url":"https:\/\/backstory.london\/products\/9781802791884","provider":"Backstory","version":"1.0","type":"link"}