Extreme Sudoku: The Techniques You NEED To Know
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Extreme Sudoku: Wings, Skyscrapers & Empty Rectangles
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This Might Be The Puzzle Of The Year (and it's only February...)
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The XY Wing a.k.a. the Y Wing: A Useful Sudoku Solving Technique When You Are STUCK !!!
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[Extreme] A Sudoku With A Sting In The Start!
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Our Hardest Sudoku And How To Solve It (Slowly!)
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Extreme Sudoku: Viewer-Requested Solve Of A Brutal Puzzle
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Solve a HARD Level Sudoku the EASY way! X wing, W wing, XY wing, and even a BUG +1
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