How To Do Hard Sudokus In 10 Minutes

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

Y-wing (XY Wing) - an Advanced Sudoku technique

Techniques for Hard Sudoku

In which I solve an EXTREME SUDOKU for Twitter

Top Nine Most Often Used Strategies for Solving Expert Sudoku Puzzles

Crack Hard Sudoku Puzzles With the Skyscraper Pattern

Tutorial 58. Hard sudoku puzzle with lots of techniques.

Can you juggle the odds and evens in this sudoku?

Making a Hard Sudoku really easy

This AMAZING Trick Can Solve Extreme Sudoku

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

'Hard' sudoku made easy - with this simple method

The Simple Trick For Hard Sudokus

Tutorial #80 A difficult sudoku puzzle made easy

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

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

These 2 Tricks Can Solve Most Of The World’s Hardest Sudokus