{"product_id":"the-big-book-of-logic-puzzles-calcudoku-400-normal-volume-21-paperback","title":"The Big Book of Logic Puzzles - Calcudoku 400 Normal (Volume 21) - Paperback","description":"\u003cp\u003eby \u003cb\u003eMykola Krylov\u003c\/b\u003e (Author)\u003c\/p\u003e\u003cp\u003eCalcudoku (also known as \"Mathdoku\") is a mathematical and logical puzzle loosely similar to Sudoku.It was invented by a Japanese mathematics teacher Tetsuya Miyamoto.The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that: - Each row contains exactly one of each digit.- Each column contains exactly one of each digit.- Each bold-outlined group of cells (block) contains digits which achieve the specified result using the specified mathematical operation: addition (+), subtraction (-), multiplication (×), and division( ).- Unlike Killer Sudoku, digits may repeat within a block.\u003c\/p\u003e\u003cdiv\u003e\n\u003cstrong\u003eNumber of Pages:\u003c\/strong\u003e 272\u003c\/div\u003e\u003cdiv\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.57 x 9 x 6 IN\u003c\/div\u003e\u003cdiv\u003e\n\u003cstrong\u003ePublication Date:\u003c\/strong\u003e February 28, 2017\u003c\/div\u003e","brand":"Books by splitShops","offers":[{"title":"Default Title","offer_id":42114502197383,"sku":"9781544186634","price":17.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/2623\/2711\/files\/9aadabab04dfce9b703c5c50ca8545de.webp?v=1732500166","url":"https:\/\/booksby.splitshops.com\/products\/the-big-book-of-logic-puzzles-calcudoku-400-normal-volume-21-paperback","provider":"Books by splitShops","version":"1.0","type":"link"}