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French newspapers in the 19th century had forms of this game, and it has appeared consistently since 1979. Nikoli began publishing Sudoku ("single number" in 1986. Played on a 9x9 grid divided into 3x3 groups of 9 or "nonets." Numbers from 1 to 9 are placed in the squares such that each row, column, or nonet has each number appearing only once.

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