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X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles
Sudoku Tutorial #40 A must know technique. NOT a puzzle.
Blockudoku Official Guide: Game Tips, Tricks & Strategies of How to Play for a High Score
Techniques for Hard Sudoku
Making a Hard Sudoku really easy
Wood Block Sudoku (by Beetles Studio) - offline block puzzle game for Android - gameplay.
Episode #1: How to Solve an Easy Sudoku Puzzle - Follow Along
Y-wing (XY Wing) - an Advanced Sudoku technique