History of Sudoku
Sudoku (originally called Number Place) is a logic-based number-placement puzzle. The objective is to fill a 9x9 square grid with digits in such way that each column, row and each of the nine 3x3 sub-grids contains all of the digits from 1 to 9. The puzzle is provided with a partially completed grid, which typically has a unique solution.
The game originates from a puzzle that was published in a Paris-based daily in 1892. It was slightly different from the game that we know today as it contained double-digit numbers and required arithmetic to solve. The puzzle was first refined in 1895 by another French newspaper, but the modern version was most likely created by Howard Garns, an American architect. It was first published by Dell Pencil Puzzles and Word Games magazine in 1979. The game became the most popular logic problem of Japan in 1986, renamed to Su Doku (Digit-single) and turned into an international hit in 2005, after it was printed by The Times of London.
There are many variations of the game. Featuring different grid sizes, combinations, numeral systems and such. Sudoku algorithms have been taken to create computer software that is able to solve puzzles and rate their difficulty. Sudoku software was used to create video game versions of the puzzle and adapted to practically all possible platforms. It can currently be found in all possible forms, from full-version computer games to printable sheets with single puzzles. Sudoku remains one of the most popular logic problems of today.
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