Tutorial #80 A difficult sudoku puzzle made easy
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Tutorial #81 Elimination Heaven. A neat trick. You can do it. Locked Little Numbers.
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Tutorial 58. Hard sudoku puzzle with lots of techniques.
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The Sudoku Trick All Expert Solvers Know
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Sudoku Tutorial # 88 The many tricks for Matching Pairs.
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Improve At Sudoku: What To Do When You Get Stuck
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Sudoku 101: Hidden Triples
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'Hard' sudoku made easy - with this simple method
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