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In which I solve an EXTREME SUDOKU for Twitter
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How To Do Hard Sudokus In 10 Minutes
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How to play Sudoku
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X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles
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Tutorial #40 A must know technique. NOT a puzzle.
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Top Nine Most Often Used Strategies for Solving Expert Sudoku Puzzles
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Y-wing (XY Wing) - an Advanced Sudoku technique
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Techniques for Hard Sudoku
