killer sudoku online Look for any cells that have more than one number or any rows, columns, or 3x3 grids that have duplicate numbers. For example, if you are solving a Sudoku puzzle and you find two cells in the same row that both contain the number 4, and there are no other cells in that row that can contain the number 4, then you have identified a naked pair of 4s. how to play sudoku quickly
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