- My Days Are Numbered - An article by Seth Stevenson offering a brief overview of Sudoku.
- Sudoku.com - Includes an overview of how Sudoku is solved, a monthly contest and a downloadable Sudoku game. Also includes a kids section.
- Sudoku Online - Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
- Web Sudoku - Free online sudoku puzzles with difficulty levels ranging from easy to evil.
- Wikipedia: Sudoku - An encyclopedia entry describing the rules, history, strategies and varients of Sudoku.
- The Daily SuDoku - A free, printable, daily sudoku puzzle. Also offers tools to help create and solve sudoku puzzles and a discussion forum.
- Sudoku Fun Puzzles - A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.
- Nikoli - From the company that introduced the game to Japan in 1984. Description, history, tutorial, and instructions on constructing custom puzzles.
- Puzzle Japan - Offers tutorial, downloadable puzzles (PDF format), and a Java applet.
- Knight Features - Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word.
- Maths Is Fun - Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.
- The Economist: Do you sudoku? - Article on the puzzle's popularity in the United Kingdom and elsewhere.
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