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

In which I solve an EXTREME SUDOKU for Twitter

How To Do Hard Sudokus In 10 Minutes

Techniques for Hard Sudoku

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

Making a Hard Sudoku really easy

'Hard' sudoku made easy - with this simple method

Easy Solving for HARD Level Sudoku Puzzles: Solve With Me

How to Solve Globe and Mail Sudoku Five Star? 14 September, 2024

Solve With Me Hard Sudoku Puzzle: Step By Step New York Times Hard Level

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

The Simple Trick For Hard Sudokus

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

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

Improve At Sudoku: What To Do When You Get Stuck

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

Crack Hard Sudoku Puzzles With the Skyscraper Pattern

Top Nine Most Often Used Strategies for Solving Expert Sudoku Puzzles

Tutorial 58. Hard sudoku puzzle with lots of techniques.

One Quick Trick To Solve Most NYT Hard Sudokus