toughest sudoku Title: Mastering Sudoku Speed: Tips and Strategies for Quick Puzzle Solving Introduction: Sudoku, a popular puzzle game, has captured the interest of millions around the world. X-Wing and Swordfish Techniques For those who have mastered the basic techniques like single-digit elimination and naked pairs, X-Wing and Swordfish are the next steps towards expert-level solving. sudoku app with auto candidate mode
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