Other
Sudoku
Multiwingspan Sudoku
These pages contain a guide to the basic strategies that can be used to solve Sudoku puzzles.
Application Download
The program used to produce the screenshots for this guide can be downloaded from this site using the link below. Extract the file when you have downloaded it and click on the file marked Sudoku.exe. You will need a recent version of .NET to be installed on your computer (Windows only).