Information For Beginners
forbeginners.info
Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.
Flying Frog Consultancy
ffconsultancy.com
This web page describes a 19-line (769-byte) OCaml program that solves Sudoku puzzles.
The Heebie Su Doku Site
sudoku.toplisted.net
Offers a glossary of terms, links to puzzles and variants, and tips for solving.
Daily Sudoku
daily-sudoku.com
Offers a different printable puzzle each day. Also includes solutions and FAQ.
The Times
timesonline.co.uk
Articles and puzzles from The Times (London).
The Sudoku Grandmaster
sudokugrandmaster.com
Self-styled Grandmaster offers tips on life as Sudoku, humorous claims of achievement, and a daily puzzle.
Sudoko Solver by Logic
sudokusolver.co.uk
JavaScript-based solver which attempts to complete grids by logic. Includes step-by-step description as well as suggesting a single move. Offers challenge to find new logical methods for "unsolvable" puzzles.
Sudoku Fun Puzzles
sudokufun.com
A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.
Erational Sudoku Helper
erational.org
Flash application to assist in solving puzzles by using basic scanning techniques. Download and source code available.
Sudoku
sudokutoday.com
Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter.
9x9, 6x6 and Samurai Sudoku
sudoku.4thewww.com
Offers classic Sudoku and variants, as well as an online solver.
Sudoku Addict
sudokuaddict.com
Offers printable grids and solution walkthroughs.
Sudoku Programmers Forum
setbb.com
Discussion forum for developers of programs such as creators, helpers, and solvers. Discussions include solving techniques, creating puzzles, mathematics, and variants.
Su Doku Master
groethe.org
Sudoku puzzle generator and solver software for Mac OS X.
SudokusWeb.com
sudokusweb.com
Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese]
DKM Sudoku Online
dkmsoftware.com
Play online puzzles at one of four difficulty levels. Also includes a solver program and hints. Software for Pocket PC and Windows also available.
Puzzle Bus
puzzlebus.com
Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.
Sudoku Java Solver Applet by Klaas
sudoku.klaas.nl
Java-based brute force solver. Displays animation of solution. Solves pre-defined puzzle or allows the user to enter his or her own puzzles.
Super Doku
clickgamer.com
Sudoku game available for Motorola V400.
Sudoku Online
sudoku.org.uk
Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
Sudoku Sensei
sourceforge.net
Open source application which describes the logic used to solve a grid, rather than using a simple brute force solution. Includes source code and samples. [Windows 95/98/NT/2000/XP, Linux]
Dan Rice's Sudoku Blog
sudokublog.typepad.com
Blog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle.
Sudoku Dragon
sudokudragon.com
Shareware puzzle solver. Generate and solve puzzles, print out the grid for solving by hand, tips and tutorials with online discussion forums. [Windows XP/2000/Me/98]
Sudoku Forum
forum.ringsworld.com
A forum for fans as well as people wanting to learn more about Sudoku.
Sudoku Puzzles
sudoku-puzzles.net
Offers four difficulty levels. The puzzles can be solved online or downloaded as a PDF file. [English/German/French/Spanish/Dutch/Portuguese/Italian]
The Guardian: So you thought Sudoku came from the Land of the Rising Sun...
observer.guardian.co.uk
Article by David Smith covering the puzzle's origins as "Number Place" by Dell Puzzle Magazine in New York in the 1970s.
Sudoku Players
sudoku.com
The sudoku.com forums. Includes discussion on solving techniques, solver programs, downloadable puzzles, sudoku for juniors and the puzzles printed in different newspapers from around the world.
Yosmany.net
sudoku.yosmany.net
Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish]
Sudoku enumeration
shef.ac.uk
Several programs in different languages for analyzing possible Sudoku combinations.
Sudoku Solver
sudokusolver.net
.NET solving program. Either offers hints or solves entire puzzle.
BBC News: The puzzling popularity of Su Doku
news.bbc.co.uk
Article by Paula Dear. Covers history in Japan and the UK and compares to the Rubik's cube craze of the 80s.
Sudoku Mobile
sudokumobile.com
Mobile phone Sudoku game software.
SudokuME
smmj.sourceforge.net
Open source Sudoku game for any Java enabled phone. Includes downloads, a game manual and user forums.
Sudoku Online Solver from friko.net
sudoku.friko.net
Free online generator, solver, and helper. [English/French/Spanish/Polish]
Fundoku
fundoku.com
Randomly generated puzzles at three difficulty levels.
Sudoku
sudoku.cc
Free daily puzzle with solution. Includes archive of past puzzles.
Wikipedia: Sudoku
en.wikipedia.org
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.
Sudoku.li
sudoku.li
History, instructions, variants and puzzles in four difficulty levels (PDF format). [German/French/English/Spanish/Italian]
Sudoku.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.
Universal Press Syndicate
amuniversal.com
Offers monochrome and color grids and variations for online and print syndication. Information on syndication as well as an interview with creator David Bodycombe.
Sudoku Samurai
binaryworlds.com
Offers printable sudoku samurai puzzles for download.
Gaby Vanhegan
vanhegan.net
Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.
Sudogo.com
sudogo.com
Offers puzzles in PDF and mySQL formats for solving offline or building into custom applications. Also offers online puzzles with three difficulty levels and customizable look-and-feel. [Dutch/English]
Hirofumi Fujiwara's Sudoku
pro.or.jp
Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese]
Simple Sudoku
angusj.com
Freeware puzzle creator for Windows.
World Sudoku Championship
wsc2006.com
Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian]
Prize Sudoku
prizesudoku.com
Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
Microride Su Doku Puzzler
su-doku.com
Microsoft .NET application for creating and playing puzzles of various difficulty levels. Also acts as a helper.
Sky One
skyone.co.uk
Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.
Solving Sudoku
angusj.com
Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques.
Sudoku Solver
sudoku-solver.com
A free utility to solve and email Sudoku puzzles.
Daily SuDoku
dailysudoku.co.uk
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.
SuDokuMate
sudokumate.com
SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving.
SadMan Software
simes.clara.co.uk
Offers shareware program that can use multiple techniques, with an emphasis on humanistic methods. Detailed explanation and illustration of basic and advanced solving techniques. Also download and purchase information.
SolveMySudoku.com
solvemysudoku.com
Browser-based puzzle solver.
Minimum Sudoku
csse.uwa.edu.au
A project collecting Sudoku with the smallest number of givens that are still uniquely solvable. Offers the puzzle for download in text format.
Killer Samurai Sudoku
killer-samurai.com
Offers printable samurai sudoku puzzles for download. Also provides rules and solution strategies.
Sudoku-Help
sudoku-help.com
Excel-based shareware helper application.
Vegard Hanssen's page
menneske.no
Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English]
Grant Gibson
grantgibson.co.uk
Offers syndicated puzzles for websites as well as print publications.
Christiaan Olie
familieolie.filternet.nl
Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English]
The Daily Sudoku
dailysudoku.co.uk
Today's daily Sudoku puzzle from www.dailysudoku.co.uk.
Sudoku-san
sudokusan.com
Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase.
Sudoku Madness
sudokumadness.net
Seven days of daily puzzles.
Sudoku Solver in Three Lines - Explained
ecclestoad.co.uk
Small bit of perl code that will generate a sudoku puzzle solution.
Sudokuto
menneske.no
Two-player variant. Offers several board sizes to play against the computer. [English/Norsk]
Simple Sudoku Solver
homepage.ntlworld.com
JavaScript brute force solver.
Math Games: Sudoku Variations
maa.org
Offers detailed descriptions and illustrations of Sudoku variations, including Diagonal, Cubical, Even-Odd, and hybrids. Also includes a short history.
Sudoku Companion
verek.com
Sudoku puzzle generator for Mac OS X.
SuDoKu Cracker by J. Pedersen
sudoku-cracker.dk
JavaScript based solver.
Mathematical Recreations
mathrec.org
Custom Word Doku puzzles devised by Steve Schaefer. Features an entire sentence embedded into the puzzle.
Sudoku Helper
pewterweb.com
Free online helper application. Shows options for each square, and allows backtrack, restart, or save.
Sudoku Place
sudokuplace.com
Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.
My Days Are Numbered
slate.com
An article by Seth Stevenson offering a brief overview of Sudoku.
Knight Features
knightfeatures.com
Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word.
The Economist: Do you sudoku?
economist.com
Article on the puzzle's popularity in the United Kingdom and elsewhere.
Sudoku Master
sudokumaster.co.uk
Free daily grids that can be printed. Also offers solution and archive.
The Guardian: Sudoku fever grips UK newspaper readers
media.guardian.co.uk
By Stephen Brook. Article covers how the UK craze got started.
Maths Is Fun
mathsisfun.net
Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.