In which I solve an EXTREME SUDOKU for Twitter

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

This AMAZING Trick Can Solve Extreme Sudoku

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

Extreme Sudoku: The Techniques You NEED To Know

How To Do Hard Sudokus In 10 Minutes

Top Nine Most Often Used Strategies for Solving Expert Sudoku Puzzles

Sudoku 'expert' level tricks. Sudoku expert level. How to solve sudoku expert level #puzzle

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

Techniques for Hard Sudoku

Improve At Sudoku: What To Do When You Get Stuck

Expert Sudoku: The Basic Techniques Used By Champions

Crack Hard Sudoku Puzzles With the Skyscraper Pattern

The Simple Trick For Hard Sudokus

Learn To Solve Diabolical/Extreme Sudoku - The XYZ Wing

How to play Sudoku in 30 seconds #sudoku #shorts

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

Х-wing - an Advanced Sudoku technique

A Sudoku Secret to Blow Your Mind - Numberphile

Making a Hard Sudoku really easy