Mirrored from Sudopedia, the Free Sudoku Reference Guide
There are a number of good Sudoku solving guides out there while Sudopedia is being built up. These guides may also serve as inspiration for contributing material into Sudopedia. However, please do not copy material verbatim from other guides into Sudopedia because of copyrights, and the authors of these guides may not want to release their material under the GNU Free Documentation License.
It should be noted that a number of guides are a bit dated. For the newest developments of Sudoku techniques, please see the Sudoku forums.
Guides that are available online for free.