![]() ![]() The mini sized sodoku is 6*6 and is often used as a variant for children. The puzzle above is presented in their paper as an example of a 17-clue sudoku with a unique solution. ![]() The minimum number of clues that is required for a sudoku to have a unique solution is 17, as shown by Gary McGuire∗, Bastian Tugemann†, Gilles Civario‡ in their paper “There is no 16-Clue Sudoku: Solving the Sudoku Minimum Number of Clues Problem via Hitting Set Enumeration”, August 31, 2013. This means a completed Sudoku is also a Latin Square. Every 3×3 square, every row and every column contains each of the numbers 1-9 exactly once. French newspapers featured variations of the puzzles in the 19th century.Ī standard Sudoku consists of a 9×9 grid, subdivided into 9 3×3 squares. The modern Sudoku started to become mainstream in 1986 by the Japanese puzzle company Nikoli, under the name Sudoku, meaning single number. It first appeared in a US newspaper and then The Times (UK) in 2004, from the efforts of Wayne Gould, who devised a computer program to rapidly produce distinct puzzles. I do offer a few exercises where copyright laws allow me to do so, or where I managed to create one myself. The reason is sheer laziness on my side: Sudoku puzzles are time demanding to produce by hand. Publishers can develop programs and run that dozens, hundreds or even thousands of times in order to produce puzzles and fill up their magazines. Many of these variants can be found in every SUDOKU magazine. I will not offer a sample puzzle of each variant type. There are probably some more around I welcome your remarks at the bottom of this post. This post I intend to list as many Sudoku variants as possible. Once a month I take a more in depth look at a certain type of puzzle.
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