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

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

Lesson 5: Learn Sudoku. The Effect of 3 Numbers in a row or column within a Block

Triplets (a.k.a Triples) and Hidden Triplets Explained - A Sudoku Strategy You MUST Know

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

How To Do Hard Sudokus In 10 Minutes

The XY Wing Part 1 Tutorial #43

Tutorial 53 Spotting a 3X3. A powerful technique in sudoku puzzles.

Tutorial #50 Solving a hard puzzle from the beginning to the end

The Sudoku With Only 2 Given Digits

Lesson 6. Sudoku Rule of exclusion. 2 empty cells hint for small numbers.

Tutorial #87. Beginners Delight. A difficult puzzle made easy

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

Lesson 1 Learn sudoku. How to solve sudoku for beginners. Horizontal blocks using TMB.

Lesson 2: Learn sudoku.Vertical Blocks using LCR and Ram

Sudoku, Tutorial #34 Managaing small numbers to solve very hard puzzles.

Lesson 7. Learn sudoku. The cross /meet technique.

Sudoku Tutorial # 88 The many tricks for Matching Pairs.

Tutorial #52 You can use these tricks for harder puzzles.

Sudoku. Lesson 4 Very important hints for solving sudoku puzzles.