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In addition to the above rule, each diagonal must also contain the numbers 1 to 9, with each number appearing exactly once. smarter sudoku

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Use a pencil: Write down potential numbers in pencil, so you can easily erase and try different combinations. smarter sudoku sudoku workbook Origin of the Word "Sudoku": The word "Sudoku" is derived from two Japanese words: "数" (sū), meaning "number," and "独" (doku), meaning "single" or "only." The game was created in 1979 by Howard Garns, an American architect, and was first published in Japan in 1984.

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