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Websites Offering Print-Free Sudoku Puzzles: There are numerous websites where you can find print-free Sudoku puzzles. free online killer sudokueasy sudoku puzzle books Utilize the Swordfish Strategy: Similar to the X-Wing strategy, the Swordfish technique involves identifying pairs of numbers that appear twice in rows or columns. It involves filling a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. sudoku puzzles for seniors
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