New york times sudoku medium
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When it comes to sudoku, there is no escape. The grids of these puzzles seem to shut down the mental apparatus, enclosing one's faculties in a tightly constrained universe — a 9 by 9 array that must be carefully filled up with the numbers 1 to 9, following certain rules. That enclosure is hypnotic. Publisher's Weekly recently counted 23 sudoku books in print with total sales of 5. Newspapers wage circulation wars by running sudoku in their pages. And sudoku Web sites and forums proliferate internationally for example, see sudoku. The winner was a year-old woman, a Czech accountant.
The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution. Completed games are always a type of Latin square with an additional constraint on the contents of individual regions. French newspapers featured variations of the Sudoku puzzles in the 19th century, and the puzzle has appeared since in puzzle books under the name Number Place. Number puzzles appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from magic squares. These weekly puzzles were a feature of French newspapers such as L'Echo de Paris for about a decade, but disappeared about the time of World War I. The modern Sudoku was most likely designed anonymously by Howard Garns , a year-old retired architect and freelance puzzle constructor from Connersville, Indiana , and first published in by Dell Magazines as Number Place the earliest known examples of modern Sudoku. In , Nikoli introduced two innovations: the number of givens was restricted to no more than 32, and puzzles became "symmetrical" meaning the givens were distributed in rotationally symmetric cells.