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- BrainBashers - - Offers daily puzzle in one of three difficulty levels. Archive of daily puzzles and an assistant.
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- Braingle Sudoku - - Interactive sudoku game with high score tracking. Includes solution strategies.
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- Count to Nine - - Offers five difficulty levels, timer, solution, and printable view.
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- Daily Sudoku Puzzle - - Offers daily timed puzzle and four difficulty levels. [English/Portuguese/Spanish/German/French/Italian.
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- Fiendish Sudoku - - Free daily sudoku puzzles at five difficulty levels. Online solving grid with hints and step-by-step solutions.
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- Free Sudokus - - Offers hints, solution checking and grids in sizes other than 3x3.
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- Goobix.com - - Offers up to four difficulty levels.
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- Number Logic - - Offers a new timed game daily, with a validator and four difficulty levels.
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- Paul's Pages - - Offers random, crafted, and non-standard puzzles. Includes hints and import/export tool.
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- Play Sudoku - - JavaScript-based Sudoku, available for syndication on other sites.
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- 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.
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- Puzzles4Free.com - - Free sudoku puzzles daily for you to solve. New puzzles every day.
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- 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.
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- Sudoku by Froggy - - Generates 2x2, 3x3, and 5x5 puzzles with adjustable level of difficulty.
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- Sudoku Central - - Offers daily puzzle for printing. Also includes archive, online solver, and solving tips.
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- Sudoku Hints - - Offers daily web-based puzzles with five difficulty levels. Includes solver, helper, and XML feed.
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- Sudoku League - - League of online competitors. Scoreboard, rules, FAQ, hall of fame, and instructions. [English/Czech.
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- Sudoku Prime - - Offers three difficulty levels and the ability to play against other players. [Requires Shockwave.
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- Sudoku Puzzles - - Daily puzzles offered at four difficulty levels, available for play online or printed out. Includes rules and archives.
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- SudokuDave - - Easy to very difficult puzzles that you can play online or print out.
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- Su-Doku.net - - Offers daily puzzle, downloadable games, and instructions.
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- Top Notch Su Doku - - Offers several web-based alternatives, including Worduku, code-duku, and Samurai sudoku. Also offers a web-based solver.
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- Web Sudoku - - Free puzzles with difficulty levels ranging from easy to evil. Provides print and online syndication.
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