{"product_id":"very-hard-calcudoku-puzzles-6x6-alena-gurin-9798702805153","title":"Very Hard Calcudoku Puzzles 6x6 Book for Adults: 200 Very Hard Calcudoku For Advanced Players","description":"The book contains 200 Calcudoku puzzles 6x6 at the level of Very Hard. All riddles have only 1 solution. Each puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result shown in the top-left corner of the block according to the math operation appearing on the top of the grid. In Calcudoku a number may be used more than once in the same block.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAuthor:\u003c\/b\u003e Alena Gurin\u003cbr\u003e\u003cb\u003eISBN-10:\u003c\/b\u003e 8702805154\u003cbr\u003e\u003cb\u003eISBN-13:\u003c\/b\u003e 9798702805153\u003cbr\u003e\u003cb\u003ePublisher:\u003c\/b\u003e Independently Published\u003cbr\u003e\u003cb\u003eLanguage:\u003c\/b\u003e English\u003cbr\u003e\u003cb\u003ePublished:\u003c\/b\u003e 01\/31\/2021\u003cbr\u003e\u003cb\u003ePages:\u003c\/b\u003e 122\u003cbr\u003e\u003cb\u003eFormat:\u003c\/b\u003e Paperback\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 0.38lbs\u003cbr\u003e\u003cb\u003eSize:\u003c\/b\u003e 9.00h x 6.00w x 0.26d","brand":"Alena Gurin","offers":[{"title":"Paperback","offer_id":43993656525055,"sku":"9798702805153","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/2982\/9887\/files\/img_221880eb-68d1-4054-8aa6-e3b1421cd4b4.jpg?v=1683325568","url":"https:\/\/www.whiterainbookhouse.com\/products\/very-hard-calcudoku-puzzles-6x6-alena-gurin-9798702805153","provider":"WR Book House","version":"1.0","type":"link"}