- Christiaan Olie
- Discusses the rules, presents variables, and proffers player strategies.
- CP- Solutions : Sudoku
- Discusses the history, provides instructions, and shows variations of the game.
- DailySudoku
- Chronicles the history of the game including puzzle rules. Answers to frequently asked questions provided.
- Flying Frog Consultancy
- Presents the programming codes used for sudoku solving applications.
- Free Sudoku Puzzle
- Explains the game's rules, variations, and solutions. Presents player guides and relevant resources.
- Fundoku
- Features an application that creates random puzzles on various difficulty levels.
- Grant Gibson
- Sells puzzles for print and online publications. Includes design tips and playing guides.
- Hirofumi Fujiwara's Sudoku
- Provides guides for puzzle creation, features a java-bases solver, and provides resource links.
- Knight Features
- Presents the game's variations, alternative rules, and player resources.
- Maths Is Fun
- Presents various solvers and creators of the gaming system for different computer OS.
- Number Logic
- Sudoku portal with newly created puzzles uploaded each day.
- Prize Sudoku
- Highlights the competitions for traditional sudoku, godoku (letters) and super sudoku (16x16) puzzles.
- Puzzle Bus
- Provides lists of puzzles and merchandise for sale; and presents links to relevant logic games.
- Scanraid LTD Search Technologies
- Explores the logical side of solving the analytical game.
- Simple Sudoku Solver
- Features a Java-based program that solves sudoku problems.
- Sky One
- Presents an article that highlights the competition and gives profiles of the winners.
- Solve My Sudoku
- Shows an interactive tool that assists in solving sudoku puzzles based on inputed information.
- Solving Sudoku
- Provides guides to solving puzzles of the game in different levels. Shows relevant resources.
- Sudoku
- Features printable sudoku puzzles and shows solutions to previous problems.
- Sudoku Addict
- Features an interactive program that generates and solves various difficulty levels of the sudoku games.
- Sudoku Enumeration
- Compiles codes for different programs for solving and analyzing sudoku problems.
- Sudoku Helper
- Highlights an interactive tool that discusses techniques of the logical game.
- Sudoku Online Solver
- Presents an interactive program that generates and solves various sudoku problems.
- Sudoku.com
- Presenting everything about sudoku. With game instructions, solutions, and discussions.
- Sudoku.org.uk
- Catering to sudoku enthusiasts. Presents discussion forums and competition details.
- Times Online: Sudoku
- Includes Sudoku puzzles and solution.
- Web Sudoku
- Online version of Sudoku offering several levels of play, including easy, medium, hard, and evil. Also offers a letter version, sale of ebooks, and version for offline play. Available in English, French, German, and Spanish.
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