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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
The Guardian: Sudoku fever grips UK newspaper readers
By Stephen Brook. Article covers how the UK craze got started.
http://media.guardian.co.uk/site/story/0,1...
Puzzle Japan
Offers tutorial, downloadable puzzles (PDF format), and a Java applet.
http://www.puzzle.jp/letsplay/play_sudoku-...
9x9, 6x6 and Samurai Sudoku
Offers classic Sudoku and variants, as well as an online solver.
http://www.sudoku.4thewww.com
Sudoku.li
Angaben zur Geschichte, eine Anleitung sowie Angaben zu Varianten des Spiels. Puzzles können in vier Schwierigkeitsgraden als PDF-Datei heruntergeladen werden.
http://www.sudoku.li/
Gaby Vanhegan
Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.
http://vanhegan.net/sudoku/
The Economist: Do you sudoku?
Article on the puzzle's popularity in the United Kingdom and elsewhere.
http://www.economist.com/displaystory.cfm?...
Nikoli
From the company that introduced the game to Japan in 1984. Description, history, tutorial, and instructions on constructing custom puzzles.
http://www.nikoli.co.jp/puzzles/1/index_te...
Daily Sudoku
Offers a different printable puzzle each day. Also includes solutions and FAQ.
http://www.daily-sudoku.com/
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/sudokum...
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/
Christiaan Olie
Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English]
http://familieolie.filternet.nl/sudokuengl...
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/446971...
Flying Frog Consultancy
This web page describes a 19-line (769-byte) OCaml program that solves Sudoku puzzles.
http://www.ffconsultancy.com/free/sudoku/
Puzzle Bus
Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.
http://www.puzzlebus.com
Fundoku
Randomly generated puzzles at three difficulty levels.
http://fundoku.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/conten...
Sudoku Place
Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.
http://sudokuplace.com/
Information For Beginners
Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.
http://www.forbeginners.info/sudoku-puzzle...
The Heebie Su Doku Site
Offers a glossary of terms, links to puzzles and variants, and tips for solving.
http://sudoku.heebie.co.uk
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://observer.guardian.co.uk/uk_news/sto...
Sudoku Helper
Free online helper application. Shows options for each square, and allows backtrack, restart, or save.
http://www.pewterweb.com/main/sudoku/nonfo...
My Days Are Numbered
An article by Seth Stevenson offering a brief overview of Sudoku.
http://www.slate.com/id/2119796
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
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 enumeration
Several programs in different languages for analyzing possible Sudoku combinations.
http://www.shef.ac.uk/~pm1afj/sudoku/
Grant Gibson
Offers syndicated puzzles for websites as well as print publications.
http://www.grantgibson.co.uk/sudoku/
SolveMySudoku.com
Browser-based puzzle solver.
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
Sky One
Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.
http://www.skyone.co.uk/programme/pgefeatu...
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
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/
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/
Yosmany.net
Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish]
http://sudoku.yosmany.net
World Sudoku Championship
Campionato Mondiale di Sudoku svoltosi a Lucca. Presenta il campionato, le classifiche, l'organizzazione.
http://www.wsc2006.com/
Dan Rice's Sudoku Blog
Blog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle.
http://sudokublog.typepad.com/sudokublog/
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 Master
Free daily grids that can be printed. Also offers solution and archive.
http://www.sudokumaster.co.uk
Sudoku
Free daily puzzle with solution. Includes archive of past puzzles.
http://sudoku.cc/
Sudoku Online Solver
Das Programm von Friko.net erstellt und löst zufällige oder vorgegebene Puzzles, druckt sie aus und macht Lösungsvorschläge.
http://sudoku.friko.net/
The Times
Articles and puzzles from The Times (London).
http://www.timesonline.co.uk/sudoku
The Sudoku Grandmaster
Self-styled Grandmaster offers tips on life as Sudoku, humorous claims of achievement, and a daily puzzle.
http://www.sudokugrandmaster.com/
SuDokuMate
SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving.
http://www.sudokumate.com/sudokumate.asp
Sudoku Addict
Offers printable grids and solution walkthroughs.
http://www.sudokuaddict.com/
SudokusWeb
Sudokus diaris gratuïts per imprimir o jugar en línia.
http://www.sudokusweb.com/
Simple Sudoku Solver
JavaScript brute force solver.
http://homepage.ntlworld.com/valleyway/sol...
Sudoku Fun Puzzles
A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.
http://www.sudokufun.com/
Sudoku Puzzles
Puzzles können in vier Schwierigkeitsstufen online gelöst oder als PDF-Datei heruntergeladen werden.
http://www.sudoku-puzzles.net/
Sudoku Online
Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
http://www.sudoku.org.uk/
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/su...
Prize Sudoku
Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
http://prizesudoku.com/
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2006