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