Play Sudoku
- http://www.play-sudoku.de/
- Registered users can save unsolved puzzles and high scores are kept at three difficulty levels. Also offers rules and tips for solving. [English/Russian/German]
Sudoku Fun Puzzles
- http://www.sudokufun.com/
- A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.
Sudoku Puzzles
- http://sudoku.com.au/
- Daily puzzles offered at four difficulty levels, available for play online or printed out. Includes rules and archives.