Japan's 'father of Sudoku' Maki Kaji dead at 69
Sudoku requires a player to put the numbers one to nine in a box made up of 81 squares, so that no number is repeated in any of the nine vertical or horizontal lines.
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Sudoku requires a player to put the numbers one to nine in a box made up of 81 squares, so that no number is repeated in any of the nine vertical or horizontal lines.
