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Asymmetrical Sudoku - Includes a generator and solver.
Bob Hanson's Sudoku Assistant - JavaScript-based gameboard and solver. Can use cross-hatch scanning and subset elimination.
BrainBashers - Offers daily puzzle in one of three difficulty levels. Archive of daily puzzles and an assistant.
Braingle Sudoku - Interactive sudoku game with high score tracking. Includes solution strategies.
Count to Nine - Offers five difficulty levels, timer, solution, and printable view.
Daily Sudoku Puzzle - Offers daily timed puzzle and four difficulty levels. [English/Portuguese/Spanish/German/French/Italian]
Fiendish Sudoku - Free daily sudoku puzzles at five difficulty levels. Online solving grid with hints and step-by-step solutions.
Free Sudokus - Offers hints, solution checking and grids in sizes other than 3x3.
Goobix.com - Offers up to four difficulty levels.
GSudokr - Online sudoku puzzles with solutions, game instructions, and timing.
Jaap Scherphuis' Generator - Java-based generator offers four levels of difficulty. Includes view of solution.
Number Logic - Offers a new timed game daily, with a validator and four difficulty levels.
Paul's Pages - Offers random, crafted, and non-standard puzzles. Includes hints and import/export tool.
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]
Play Sudoku - JavaScript-based Sudoku, available for syndication on other sites.
Puzzles4Free.com - Free sudoku puzzles daily for you to solve. New puzzles every day.
Ridiculopathy - Sudoku Shuffle - Play with letters or numbers in the grid. Includes high scores, hints and move verification. [Requires Flash]
Seeing With C - Sudoku Solver - A solver program with an article explaining the algorithm used.
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.
Sudoku by Froggy - Generates 2x2, 3x3, and 5x5 puzzles with adjustable level of difficulty.
Sudoku Central - Offers daily puzzle for printing. Also includes archive, online solver, and solving tips.
Sudoku Fun Puzzles - A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.
Sudoku Hints - Offers daily web-based puzzles with five difficulty levels. Includes solver, helper, and XML feed.
Sudoku League - League of online competitors. Scoreboard, rules, FAQ, hall of fame, and instructions. [English/Czech]
Sudoku Online - Online play with several different variants.
Sudoku Prime - Offers three difficulty levels and the ability to play against other players. [Requires Shockwave]
Sudoku Puzzles - Daily puzzles offered at four difficulty levels, available for play online or printed out. Includes rules and archives.
Sudoku Zone - Play sudoku puzzles online for free.
SudokuDave - Easy to very difficult puzzles that you can play online or print out.
Su-Doku.net - Offers daily puzzle, downloadable games, and instructions.
s.udok.us - A new Sudoku puzzle every day and an archive of old grids.
Web Sudoku - Free puzzles with difficulty levels ranging from easy to evil. Provides print and online syndication.