X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles

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Large Print SUDOKU Puzzles Book: 100+ Easy to Hard Puzzles - Train your brain anywhere, anytime!

Triplets (a.k.a Triples) and Hidden Triplets Explained - A Sudoku Strategy You MUST Know

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Solve this Hard Sudoku puzzle in 16 minutes (with a PDF file) 04-12-2019 part 2 of 2

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Sudoku Solver - Watch as I Complete A Easy Square Puzzle #6

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