I have developed a web site dedicated to helping people learn how to play sudoku. It has specially designed puzzles to focus on individual techniques and a graphical hint interface to aid people that get stumped.
It provides specific lesson plans for Hidden Singles/Naked Singles, Block and Row/Column interactions, Block and Block interactions, Naked Subsets, Hidden Subsets, XY Wings, X-Wings, Swordfish, Coloring and Forcing Chains.
I would appreciate feedback as to whether anyone finds this type of web site useful. The web site is www.sudokulearningcenter.com
Regards
Pat