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