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

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Book: Pocket Puzzles - Very Hard Sudoku (large print).

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

Sudoku Primer 323 - Techniques Make a Hard Puzzle Easier

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A genius can solve in 10 seconds! 🤯 #shorts #puzzle #riddle

Sudoku solution – New York Times 7 July 2021 Hard level (done on paper)