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

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Tutorial #100 A SPECIAL GUEST.

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Lesson 21.Sudoku. The Xwing plus scenarios.

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Is This Sudoku Impossible?

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How to Speak

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

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Sudoku. Lesson 18 The amazing 3X3.

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