{"product_id":"killer-x-sudoku-200-hard-9x9-killer-diagonal-sudoku-9781704690247","title":"Killer X Sudoku: 200 Hard 9x9 Killer Diagonal Sudoku","description":"The objective is to fill the grid with numbers from 1 to 9 in a way that the following conditions are met: Each row, column, and nonet contains each number exactly once.The sum of all numbers in a cage must match the small number printed in its corner.No number appears more than once in a cage. (This is the standard rule for killer sudokus, and implies that no cage can include more than 9 cells.)In 'Killer X', an additional rule is that each of the long diagonals contains each number once\u003cbr\u003e","brand":"Independently Published","offers":[{"title":"Default Title","offer_id":50369121419538,"sku":"9781704690247","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/4771\/8930\/files\/img_e5e0af53-1a2c-4df2-89da-b45d52e1b99a.jpg?v=1728521277","url":"https:\/\/surprise-castle.myshopify.com\/products\/killer-x-sudoku-200-hard-9x9-killer-diagonal-sudoku-9781704690247","provider":"Surprise Castle","version":"1.0","type":"link"}