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