Sudoku

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Sudoku (??, sudoku?), also known as Number Place or Nanpure, is a logic-based placement puzzle. The objective is to fill the grid so that every column, every row and every 3×3 box contains the digits 1 to 9. The puzzle setter provides a partially completed grid so that there is only one solution. Completed Sudoku puzzles are a type of Latin square, with an additional constraint on the contents of individual regions. Leonhard Euler is sometimes (incorrectly) cited as the source of the puzzle, based on his work with Latin squares[1]. The modern puzzle was invented by an American, Howard Garns, in 1979 and published by Dell Magazines under the name "Number Place"[2]. It became popular in Japan in 1986, when it was published by Nikoli and given the name Sudoku. It became an international hit in 2005. The name "Sudoku" is the Japanese abbreviation of a longer phrase, "Suji wa dokushin ni kagiru" (????????, "Suji wa dokushin ni kagiru"?), meaning "the digits must occur only once"[3][4][5][6][7][8]. It is a trademark of puzzle publisher Nikoli Co. Ltd. in Japan.[9] In Japanese, the word is pronounced[s??dok?]; in English, it is usually spoken with an Anglicised pronunciation,[s?'d??ku?] (BrE)[s?'do?ku?] (AmE) or['su?d??ku] (BrE)['su?do?ku] (AmE) (See IPA (International Phonetic Alphabet) or IPA chart for English for notation usage.) Other Japanese publishers refer to the puzzle as Number Place, the original U.S. title, or as "Nanpure" for short.[10] Some non-Japanese publishers spell the title as "Su Doku". The numerals in Sudoku puzzles are used for convenience; arithmetic relationships between numerals are irrelevant. Any set of distinct symbols will do; letters, shapes, or colours may be used without altering the rules. In fact, ESPN published Sudoku puzzles substituting the positions on a baseball field for the numbers 1–9. Dell Magazines, the puzzle's originator, has been using numerals for Number Place in its magazines since they first published it in 1979.[10]The attraction of the puzzle is that the rules are simple, yet the line of reasoning required to solve the puzzle may be complex. The level of difficulty can be selected to suit the audience. The puzzles are often available free from published sources and may be custom-made using software. Anybody else like this game?