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Coloring and Grid Elimination : These techniques involve coloring rows, columns, and boxes and eliminating numbers based on the coloring. sudoku online hardautomatic sudoku solver Solve the puzzles: Use your logical reasoning skills to fill in the empty cells with the correct numbers, ensuring that each row, column, and 3x3 subgrid contains all the digits from 1 to 9. How to Use Swordfish: Identify a 4x4 or 5x5 square with the same number appearing in four different cells. sudoku contest
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