See also: | This category in other languages: | | | |
 | - 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.
 | - 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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