The winner of the latest sudoku contest is hetty with 187 250 points
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Sudoku ebook :
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Rules of sudoku :
Enter a numerical digit from 1 through 9 in each blank cell of the Sudoku grid. Be carefull : Every row, every column and every square must contain only one instance of each numeral.
History of sudoku
The modern Sudoku was designed by Howard Garns in 1979.
The puzzle was introduced in Japan by Nikoli in 1984.
In 1997, Wayne Gould developed a computer program to produce puzzles and promoted it in British newspapers
Find details in Wikipedia