Play Sudoku online? No questions. Go to online version and have fun. Cool features: saving games, printing.
If you want to read about Sudoku (history, rules, solution methods) please go to Wikipedia.
You don't like play online? May be it will be usefull to get free windows version of Sudoku. Just go downloads section.
If you want to read about this site please go here.
Any questions? Propositions? Complaints? Plese write it me to firstname.lastname@example.org.