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Sudoku. Lesson 2 vertical blocks using LCR and Ram

Lesson 3: Learn Sudoku. Matching pairs, two empty cells

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

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Sudoku Tutorial # 88 The many tricks for Matching Pairs.

Lesson 4. Learn Sudoku. Very Important hints.

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Sudoku. Lesson 18 The amazing 3X3.

Tutorial #99 WOW Lots to learn for all levels.

Tutorial 58. Hard sudoku puzzle with lots of techniques.

Lesson 10. Sudoku 3 empty cells in a line within a block

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Lesson 12 Sudoku The "Outside the puzzle technique"