- Sudoku - Japanese puzzle game played by placing numbers in a grid so that each number only appears once in each row, column, and region. Offers three difficulty levels.
- Goobix.com - Offers up to four difficulty levels.
- Bob Hanson's Sudoku Assistant - JavaScript-based gameboard and solver. Can use cross-hatch scanning and subset elimination.
- Top Notch Su Doku - Offers several web-based alternatives, including Worduku, code-duku, and Samurai sudoku. Also offers a web-based solver.
- Sudoku League - League of online competitors. Scoreboard, rules, FAQ, hall of fame, and instructions. [English/Czech]
- Number Logic - Offers a new timed game daily, with a validator and four difficulty levels.
- Core Games: Digit Hunt - Java applet offering undo, redo, and a solver. New puzzle daily.
- Sudoku Prime - Offers three difficulty levels and the ability to play against other players. [Requires Shockwave]
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