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Intermediate puzzles: Once comfortable with beginner puzzles, move on to intermediate puzzles to keep the brain engaged. sudoku leetcodechess sudoku Apply the "X-Wing" and "Swordfish" Techniques: These advanced techniques are helpful for solving complex puzzles. The New York Times Sudoku Hard is renowned for its challenging puzzles that test the wit and logic of even the most seasoned solvers. sudoku central
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sudoku leetcode Tips for Improving Your Sudoku Speed
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