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.
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.
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.
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]
Sudoku Central
Offers daily puzzle for printing. Also includes archive, online solver, and solving tips.
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 Puzzles
Daily puzzles offered at four difficulty levels, available for play online or printed out. Includes rules and archives.
Web Sudoku
Free puzzles with difficulty levels ranging from easy to evil. Provides print and online syndication.
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