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

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

X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles

Pencil Marking candidates and using “Snyder” notation in Sudoku: Complete Example

Hidden pairs - a Sudoku technique for beginners

Using Intersecting Lines When you're stuck on a Sudoku Puzzle - Basic Strategy

Locked Candidates Type I (Pointing) / Sudoku Tutorial #6

How To Do Hard Sudokus In 10 Minutes

Sudoku Tutorial #7-A / Locked Candidates Examples & Tips

dxSudoku #5 Locked Candidates (Types 1 and 2)

The Logic of AICs in Sudoku / Tutorial #4

Sudoku Terminology / Tutorial #2

Remote Pairs Sudoku Chain Strategy

Sudoku Tutorial #3-A Part 1 / Strong Links & Weak Links Examples & Tips

Techniques for Hard Sudoku

The Best Way to Enter Candidates in Newspaper Sudoku Puzzles

Empty Rectangle and the LOGIC Behind It

The Matching Pair and Naked Singles – Beginner Sudoku Strategies you MUST know

Strong Links & Weak Links in Sudoku / Tutorial #3

How to Find and Use Triplets in Sudoku Puzzles / Tutorial #9