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

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

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/

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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/

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

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

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

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

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/

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

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

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

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/

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/

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/

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

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

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

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

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/

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

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 - 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-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/

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

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

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

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

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

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

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

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/

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/