{"product_id":"unknown-black-belt-sudoko-9781402740244","title":"Black Belt Sudoko","description":"Sudoku (数独 sūdoku?, すうどく) About this sound listen (help·info); English pronunciation: \/suːˈdoʊkuː\/ soo-DOH-koo is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called \"boxes\", \"blocks\", \"regions\", or \"sub-squares\") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution. Completed puzzles are always a type of Latin square with an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same 9×9 playing board row or column or in any of the nine 3×3 subregions of the 9×9 playing board. The puzzle was popularized in 1986 by the Japanese puzzle company Nikoli, under the name Sudoku, meaning single number. It became an international hit in 2005.","brand":"Sterling Publishing Co., Inc.","offers":[{"title":"Default Title","offer_id":53731839574358,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":false}],"url":"https:\/\/www.momoxbooks.com\/products\/unknown-black-belt-sudoko-9781402740244","provider":"momoxbooks","version":"1.0","type":"link"}