Sudoku is a logic puzzle where the aim is to place the numbers 1 through 9 in every square in the 9x9 grid so that every row, column and 3x3 "region" includes each number once only.
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- Daily Sudoku Puzzle Offers daily timed puzzle and four difficulty levels. [English/Portuguese/Spanish/German/French/Italian]
- Sudoku Hints Offers daily web-based puzzles with five difficulty levels. Includes solver, helper, and XML feed.
- Fiendish Sudoku Free daily sudoku puzzles at five difficulty levels. Online solving grid with hints and step-by-step solutions.
- Goobix.com Offers up to four difficulty levels.
- Bob Hanson's Sudoku Assistant JavaScript-based gameboard and solver. Can use cross-hatch scanning and subset elimination.
- Web Sudoku Free puzzles with difficulty levels ranging from easy to evil. Provides print and online syndication.
- Paul's Pages Offers random, crafted, and non-standard puzzles. Includes hints and import/export tool.
- Sudoku by Froggy Generates 2x2, 3x3, and 5x5 puzzles with adjustable level of difficulty.
- Su-Doku.net Offers daily puzzle, downloadable games, and instructions.
- BrainBashers Offers a daily Sudoku with six levels of difficulty, with an archive of old puzzles and an interactive assistant.
- Sudoku Puzzles Daily puzzles offered at four difficulty levels, available for play online or printed out. Includes rules and archives.
- Braingle Sudoku Interactive sudoku game with high score tracking. Includes solution strategies.
- Seeing With C - Sudoku Solver A solver program with an article explaining the algorithm used.
- Sudoku Zone Play sudoku puzzles online for free.
- Jaap Scherphuis' Generator Java-based generator offers four levels of difficulty. Includes view of solution.
- Picture Sudoku Uses pictures instead of numbers.
- Speed Sudoku Play fast-paced online sudoku races for free.
- Creative Spark Studios: Sudoku Includes a generator.