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Pigeonhole Principle: If there are only two possible numbers left in a row, column, or subgrid, one of them must go in a specific cell. sudoku games without ads It is considered a more challenging version of the original Sudoku, with more complex rules and patterns. tricks to do sudoku So, whether you're looking to sharpen your logical thinking skills or just want to pass the time with a challenging game, the Sudoku Helper is the ultimate companion for your Sudoku journey. puzzlemadness jigsaw sudoku Use X-Wing and Swordfish strategies: These are advanced techniques that involve finding patterns of numbers within the grid. sudoku printable freesudoku post Step 6: Use the "Swordfish" Technique When you've exhausted the above techniques, it's time to use the "Swordfish" technique.