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» Automatic Sudoku solver 
Web-based application for automatic Sudoku solving.
http://www.jarek.cz/en/logical-puzzles/
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» Christiaan Olie
Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English]
http://familieolie.filternet.nl/sudokuenglish.html
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» Daily SuDoku
Offers daily printable puzzles of varying difficulties, including Sudoku for Kids. Also offers archive of past puzzles, tool for rendering custom puzzles, FAQ, and books for purchase.
http://www.dailysudoku.co.uk/
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» Daily Sudoku
Offers a different printable puzzle each day. Also includes solutions and FAQ.
http://www.daily-sudoku.com/
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» Dan Rice's Sudoku Blog
Weblog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle.
http://sudokublog.typepad.com/sudokublog/
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» Flying Frog Consultancy
This web page describes a 19-line (769-byte) OCaml program that solves Sudoku puzzles.
http://www.ffconsultancy.com/free/sudoku/
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» Free Sudoku Puzzles
Offers a free javascript version of the sudoku game.
http://www.freesudokupuzzles.org
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» Gaby Vanhegan
Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.
http://vanhegan.net/sudoku/
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» Grant Gibson
Offers syndicated puzzles for websites as well as print publications.
http://www.grantgibson.co.uk/sudoku/
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» Hirofumi Fujiwara's Sudoku
Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese]
http://www.pro.or.jp/~fuji/index-eng.html
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» Information For Beginners
Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.
http://www.forbeginners.info/sudoku-puzzles/
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» Knight Features
Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word.
http://www.knightfeatures.com/KFWeb/content/features/kffeatures/puzzlesandcrosswords/KF/Sudoku/Sudoku_Classic/sudoku_classic.html
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» Maths Is Fun
Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.
http://www.mathsisfun.net/puzzles.htm
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» Minimum Sudoku
A project collecting Sudoku with the smallest number of givens that are still uniquely solvable. Offers the puzzle for download in text format.
http://www.csse.uwa.edu.au/~gordon/sudokumin.php
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» My Days Are Numbered
An article by Seth Stevenson offering a brief overview of Sudoku.
http://www.slate.com/id/2119796
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» Play Sudoku
Flash version of the Sudoku game. Also offers solution.
http://www.play-sudoku.com
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» Prize Sudoku
Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
http://prizesudoku.com/
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» Puzzle Bus
Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.
http://www.puzzlebus.com
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» Scanraid LTD Search Technologies
Sudoku Solver by Andrew Stuart. Shows the logic behind solving sample games square by square.
http://www.scanraid.com/sudoku.htm
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» Simple Sudoku Solver
JavaScript brute force solver.
http://homepage.ntlworld.com/valleyway/solver.html
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» Sky One
Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.
http://www.skyone.co.uk/programme/pgefeature.aspx?pid=48&fid=129
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» Solve My Sudoku
Solves puzzles based on inputted information.
http://www.solvemysudoku.com/
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» Solving Sudoku
Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques.
http://angusj.com/sudoku/hints.php
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» SuDoKu-Cracker
Only creates puzzles with a "unique solution". The built-in generator has six different levels of difficulty and can generate many (millions) different puzzles. All puzzles can be printed, exported, saved and opened again.
http://www.the24net.com/sudoku/
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» SuDokuMate
SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving.
http://www.sudokumate.com/sudokumate.asp
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» Sudoku
Generates and solves classic and X-Sudoku Problems. Diverse options and an integrated help facility makes this program best of class.
http://home.arcor.de/clemens-pichl/Sudoku.htm
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» Sudoku Addict
Offers printable grids and solution walkthroughs.
http://www.sudokuaddict.com/
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» Sudoku Online
Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
http://www.sudoku.org.uk/
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» Sudoku Online Solver
Free online generator, solver, and helper. [English/French/Spanish/Polish]
http://sudoku.friko.net/
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» Sudoku Place
Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.
http://sudokuplace.com/
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» Sudoku Puzzles
Free daily puzzles with five difficulty levels with their solutions. Also offers guide to solve Sudoku puzzles.
http://www.sudokupuzz.com
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» Sudoku enumeration
Several programs in different languages for analyzing possible Sudoku combinations.
http://www.shef.ac.uk/~pm1afj/sudoku/
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» Sudoku-san
Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase.
http://www.sudokusan.com/
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» Sudoku.com
Includes an overview of how Sudoku is solved, a monthly contest and a downloadable Sudoku game. Also includes a kids section and discussion forums.
http://www.sudoku.com/
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» SudokusWeb.com
Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese]
http://www.sudokusweb.com/
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» Sudoweb
Free daily puzzles with five difficulty levels. Also offers printable e-book.
http://www.sudoweb.com
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» The Economist: Do you sudoku?
Article on the puzzle's popularity in the United Kingdom and elsewhere.
http://www.economist.com/displaystory.cfm?story_id=3992476
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» The Heebie Su Doku Site
Offers a glossary of terms, links to puzzles and variants, and tips for solving.
http://sudoku.toplisted.net/syndicate/feed.php?syndtype=top&syndid=1648
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» The Times Sudoku
Daily sudoku and killer sudoku puzzles from The Times newspaper, London.
http://entertainment.timesonline.co.uk/tol/arts_and_entertainment/games_and_puzzles/sudoku/
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» Universal Press Syndicate
Offers monochrome and color grids and variations for online and print syndication. Information on syndication as well as an interview with creator David Bodycombe.
http://www.amuniversal.com/ups/features/sudoku/
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» Vegard Hanssen's page
Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English]
http://www.menneske.no/sudoku/eng/
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» Wikipedia: Sudoku
An encyclopedia entry describing the rules, history, strategies and variants of Sudoku. Notes that these are a type of "latin square" which have been analyzed since ancient times.
http://en.wikipedia.org/wiki/Sudoku
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» World Sudoku Championship
Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian]
http://www.wsc2006.com/
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» Yosmany.net
Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish]
http://sudoku.yosmany.net
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