tontonan
In which I solve an EXTREME SUDOKU for Twitter
The Sudoku With Only 2 Given Digits
How to play Sudoku
How To Do Hard Sudokus In 10 Minutes
Sudoku Tutorial #40 A must know technique. NOT a puzzle.
Y-wing (XY Wing) - an Advanced Sudoku technique
Sudoku.com - Classic Logic Puzzle Game by Easybrain
Sudoku solved by World Sudoku Champion