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Bob Hanson's Sudoku Assistant JavaScript-based gameboard and solver. Can use cross-hatch scanning and subset elimination. http://www.stolaf.edu/people/hansonr/sudoku/
BrainBashers Offers daily puzzle in one of three difficulty levels. Archive of daily puzzles and an assistant. http://www.brainbashers.com/sudoku.asp
Braingle Sudoku Interactive sudoku game with high score tracking. Includes solution strategies. http://www.braingle.com/games/sudoku/index.php
Count to Nine Offers five difficulty levels, timer, solution, and printable view. http://www.counttonine.com/
Daily Sudoku Puzzle Offers daily timed puzzle and four difficulty levels. [English/Portuguese/Spanish/German/French/Italian] http://www.daily-sudoku-puzzle.com/
Fiendish Sudoku Free daily sudoku puzzles at five difficulty levels. Online solving grid with hints and step-by-step solutions. http://www.fiendishsudoku.com/
Free Sudokus Offers hints, solution checking and grids in sizes other than 3x3. http://www.free-sudokus.com/
Goobix.com Offers up to four difficulty levels. http://www.goobix.com/games/sudoku/
GSudokr Online sudoku puzzles with solutions, game instructions, and timing. http://www.gsudokr.com/
Jaap Scherphuis' Generator Java-based generator offers four levels of difficulty. Includes view of solution. http://www.geocities.com/jaapsch/sudoku.htm
Number Logic Offers a new timed game daily, with a validator and four difficulty levels. http://www.number-logic.com
Paul's Pages Offers random, crafted, and non-standard puzzles. Includes hints and import/export tool. http://www.paulspages.co.uk/sudoku/
Play Sudoku 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] http://www.play-sudoku.de/
Play Sudoku JavaScript-based Sudoku, available for syndication on other sites. http://www.geocities.com/binnyva/code/javascript/sudoku/
Puzzles4Free.com Free sudoku puzzles daily for you to solve. New puzzles every day. http://www.puzzles4free.com/sudoku/
Ridiculopathy - Sudoku Shuffle Play with letters or numbers in the grid. Includes high scores, hints and move verification. [Requires Flash] http://www.ridiculopathy.com/crappy_flash_games.php?gamename=sudoku
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. http://www.sudoku.name/
Sudoku by Froggy Generates 2x2, 3x3, and 5x5 puzzles with adjustable level of difficulty. http://www.orcapia.com/froggy/sudoku/
Sudoku Central Offers daily puzzle for printing. Also includes archive, online solver, and solving tips. http://www.sudokucentral.com/
Sudoku Fun Puzzles A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times. http://www.sudokufun.com/
Sudoku Hints Offers daily web-based puzzles with five difficulty levels. Includes solver, helper, and XML feed. http://www.sudokuhints.com/
Sudoku League League of online competitors. Scoreboard, rules, FAQ, hall of fame, and instructions. [English/Czech] http://www.sudoku-league.com/
Sudoku Online Online play with several different variants. http://www.sudokuonline.ro/en/puzzle/
Sudoku Puzzles Daily puzzles offered at four difficulty levels, available for play online or printed out. Includes rules and archives. http://sudoku.com.au/
Sudoku Zone Play sudoku puzzles online for free. http://sudoku-zone.50webs.com
SudokuDave Easy to very difficult puzzles that you can play online or print out. http://www.geocities.com/da5id65536/SudokuDave/
Su-Doku.net Offers daily puzzle, downloadable games, and instructions. http://www.su-doku.net/
s.udok.us A new Sudoku puzzle every day and an archive of old grids. http://s.udok.us
Web Sudoku Free puzzles with difficulty levels ranging from easy to evil. Provides print and online syndication. http://www.websudoku.com/
