killer sudoku puzzles Use a pencil: It is essential to use a pencil when solving Sudoku puzzles, as you may need to erase incorrect answers.
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killer sudoku puzzles For example, if you see three cells in a row with the numbers 1, 2, and 3, and no other 1, 2, or 3s in that row, you have identified a triple. Step 2: Use the "Pencil-In" Technique When you can't determine a single number for a cell, use the "pencil-in" technique. sudoku solve methods
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