sudoku

Noun

sudoku (countable and uncountable, plural sudokus)

1. A type of pencil puzzle played on a square grid, requiring each of the columns, each of the rows, and each of the subregions (called "boxes" or "regions") to contain the lowest whole numbers up to the dimension of the puzzle, usually 1 to 9, once each. The subregions are rectangular or square except in variants.
   • For Preston is the publishing director at Puzzler Media, which creates magazines filled with puzzles, including one called sudoku that has taken Britain by storm. […] The puzzles are widely available over the Internet because efforts to trademark the name in Britain have not been successful, and...2005 May 23, Eric Pfanner, “Puzzling phenomenon sweeps British papers”, in The New York Times, archived from the original on 28 Oct 2021
   • In fact, anything we do just to kill time—even essentially healthy activities like reading, chatting on the phone, or completing a sudoku puzzle—becomes a 'time thief.2008, Jan Silvious, Smart Girls Think Twice: Making Wise Choices When It Counts, Thomas Nelson, →ISBN, page 61

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