Web Directory

» 9x9, 6x6 and Samurai Sudoku
   Offers classic Sudoku and variants, as well as an online solver.
   http://www.sudoku.4thewww.com

» BBC News: The puzzling popularity of Su Doku
   Article by Paula Dear. Covers history in Japan and the UK and compares to the Rubik's cube craze of the 80s.
   http://news.bbc.co.uk/1/hi/magazine/4469719.stm

» Christiaan Olie
   Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English]
   http://familieolie.filternet.nl/sudokuenglish.html

» 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/

» Daily Sudoku
   Offers a different printable puzzle each day. Also includes solutions and FAQ.
   http://www.daily-sudoku.com/

» 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/

» Flying Frog Consultancy
   This web page describes a 19-line (769-byte) OCaml program that solves Sudoku puzzles.
   http://www.ffconsultancy.com/dotnet/fsharp/sudoku/index.html

» Free Sudoku Puzzles
   Offers a free javascript version of the sudoku game.
   http://www.freesudokupuzzles.org

» Gaby Vanhegan
   Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.
   http://vanhegan.net/sudoku/

» Grant Gibson
   Offers syndicated puzzles for websites as well as print publications.
   http://www.grantgibson.co.uk/sudoku/

» 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

» Information For Beginners
   Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.
   http://www.forbeginners.info/sudoku-puzzles/

» 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

» 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

» 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

» My Days Are Numbered
   An article by Seth Stevenson offering a brief overview of Sudoku.
   http://www.slate.com/id/2119796

» Play Sudoku
   Flash version of the Sudoku game. Also offers solution.
   http://www.play-sudoku.com

» Prize Sudoku
   Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
   http://prizesudoku.com/

» Puzzle Bus
   Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.
   http://www.puzzlebus.com

» 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

» Simple Sudoku Solver
   JavaScript brute force solver.
   http://homepage.ntlworld.com/valleyway/solver.html

» 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

» Solve My Sudoku
   Solves puzzles based on inputted information.
   http://www.solvemysudoku.com/

» Solving Sudoku
   Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques.
   http://angusj.com/sudoku/hints.php

» SuDoKu-Cracker
   Generates Sudoku and Wordoku puzzles with seven different levels of difficulty. All puzzles can be printed, exported, and saved.
   http://www.the24net.com/sudoku/

» SuDokuMate
   SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving.
   http://www.sudokumate.com/sudokumate.asp

» Sudoku
   History, instructions, variants and puzzles in four difficulty levels (PDF format). [German/French/English/Spanish/Italian]
   http://www.sudoku.li/english/

» Sudoku Addict
   Offers printable grids and solution walkthroughs.
   http://www.sudokuaddict.com/

» Sudoku Madness
   Seven days of daily puzzles.
   http://www.sudokumadness.net/syndication/weekly.rss

» Sudoku Online
   Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
   http://www.sudoku.org.uk/

» Sudoku Online Solver
   Free online generator, solver, and helper. [English/French/Spanish/Polish]
   http://sudoku.friko.net/

» Sudoku Place
   Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.
   http://sudokuplace.com/

» Sudoku Puzzles
   Offers four difficulty levels. The puzzles can be solved online or downloaded as a PDF file. [English/German/French/Spanish/Dutch/Portuguese/Italian]
   http://www.sudoku-puzzles.net/

» Sudoku enumeration
   Several programs in different languages for analyzing possible Sudoku combinations.
   http://www.afjarvis.staff.shef.ac.uk/sudoku/

» 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/

» 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/

» SudokusWeb.com
   Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese]
   http://www.sudokusweb.com/

» Sudoweb
   Free daily puzzles with five difficulty levels. Also offers printable e-book.
   http://www.sudoweb.com

» The Daily Sudoku
   Today's daily Sudoku puzzle from www.dailysudoku.co.uk.
   http://www.dailysudoku.co.uk/sudoku/rss.xml

» 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

» The Guardian: So you thought Sudoku came from the Land of the Rising Sun...
   Article by David Smith covering the puzzle's origins as "Number Place" by Dell Puzzle Magazine in New York in the 1970s.
   http://www.guardian.co.uk/media/2005/may/15/pressandpublishing.usnews

» The Guardian: Sudoku fever grips UK newspaper readers
   By Stephen Brook. Article covers how the UK craze got started.
   http://www.guardian.co.uk/media/2005/may/10/pressandpublishing.uknews

» 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

» 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/

» 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/

» 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/

» 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

» 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/

» Yosmany.net
   Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish]
   http://sudoku.yosmany.net

» pi-c-it Sudoku
   Generates and solves classic and X-Sudoku problems. Diverse options and an integrated help facility.
   http://www.pi-c-it.de/Sudoku/index.php?lang=en