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3 9 1 2
5 8
4 3
1 9
6 4 1
4 8 7
3 7
6 3 5
7 8 1

The Rules of Sudoku

General Every Sudoku has a unique solution that can be reached logically without guessing (even on the expert puzzles). Fill in the grid such that every row, column, and 3x3 box contains all of the digits from 1 to 9.

Expert Difficulty Solving Strategies

In order to solve the expert puzzles, you'll need to know four advanced solving techniques. Here are their names: X-Wing XY-Wing (Y-Wing) Swordfish Simple Chaining (Colouring) And here are some links: X-Wing & Swordfish techniques explained XY-Wing strategy Simple Chaining A full list of Sudoku solving techniques

Sudokus For Your Website

If you own a website and would like to add Razzle's sudoku puzzles on it, all you have to do is copy this one line of code somewhere in your website's html. If you would like to customize the size and border of the above puzzle widget, or if you have a personalized home page on iGoogle, Facebook, Microsoft Live, Pageflakes, Netvibes (and more!) and would like to add Razzle's puzzle widget to it, please visit the widget page.