Looking for "naked pairs" (two cells in the same row, column, or box that contain only the same two numbers as possibilities).If you get stuck, try using the following techniques:.Repeat steps 1-3 until the puzzle is solved, or until you reach a point where you cannot make any more progress using these methods. If a cell can only contain one number, and that number must go in that cell, then all other cells in the same row, column, and box can be eliminated as possibilities for that number. If there is only one cell in a row, column, or box that can hold a specific number, then that cell must contain that number.
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