Sudoku

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/free/sudoku/

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/

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

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

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
Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter.
http://www.sudokutoday.com

Sudoku
Free daily puzzle with solution. Includes archive of past puzzles.
http://sudoku.cc/

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

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

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

Sudoku enumeration
Several programs in different languages for analyzing possible Sudoku combinations.
http://www.shef.ac.uk/~pm1afj/sudoku/

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
Free daily puzzles with five difficulty levels with their solutions. Also offers guide to solve Sudoku puzzles.
http://www.sudokupuzz.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.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/

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/

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

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/

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 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/

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

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

My Days Are Numbered
An article by Seth Stevenson offering a brief overview of Sudoku. <small>(May 31, 2005)</small>
http://www.slate.com/id/2119796

The Economist: Do you sudoku?
Article on the puzzle's popularity in the United Kingdom and elsewhere. <small>(May 19, 2005)</small>
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. <small>(May 15, 2005)</small>
http://observer.guardian.co.uk/uk_news/story/0,6903,1484328,00.html

The Guardian: Sudoku fever grips UK newspaper readers
By Stephen Brook. Article covers how the UK craze got started. <small>(May 10, 2005)</small>
http://media.guardian.co.uk/site/story/0,14173,1480828,00.html

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. <small>(April 22, 2005)</small>
http://news.bbc.co.uk/1/hi/magazine/4469719.stm

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

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