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Tutorial #40 A must know technique. NOT a puzzle.

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Tutorial #56. A difficult puzzle solved from beginning to end. Lots to learn.

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Sudoku Tutorial #62. How to spot an X wing using rows, and then knowing what to do!

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Sudoku Tutorial # 88 The many tricks for Matching Pairs.

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Sudoku Tutorial #98 The power of triplets and matching pairs.

Tutorial #80 A difficult sudoku puzzle made easy

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Sudoku tutorial #93 A procedure or not!