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How to play Sudoku
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1. Fill the grid so that the numbers 1 through 9 appear in
each row.
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2. Fill the grid so that the numbers 1
through 9 appear in each column.
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3. Fill the grid so that the numbers 1
through 9 appear in each 3x3 box.
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4. A complete Sudoku puzzle contains the
numbers 1 through 9 in every row, column, and 3x3 box.
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