Sudoku Source

Christiaan Olie - Personal page describing Sudoku, rules, strategies, and offering puzzles to print.

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.

Daily Sudoku - Offers a different printable puzzle each day. Also includes solutions and FAQ.

Dan Rice's Sudoku Blog - Blog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle.

Flying Frog Consultancy - This web page describes a 19-line (769-byte) OCaml program that solves Sudoku puzzles.

Fundoku - Randomly generated puzzles at three difficulty levels.

Gaby Vanhegan - Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.

Grant Gibson - Offers syndicated puzzles for websites as well as print publications.

The Heebie Su Doku Site - Offers a glossary of terms, links to puzzles and variants, and tips for solving.

Hirofumi Fujiwara's Sudoku - Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources.

Information For Beginners - Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.

Knight Features - Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word.

Maths Is Fun - Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.

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.

Nikoli - From the company that introduced the game to Japan in 1984. Description, history, tutorial, and instructions on constructing custom puzzles.

Prize Sudoku - Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and
Super Sudoku (16x16).

Puzzle Bus - Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.

Puzzle Japan - Offers tutorial, downloadable puzzles (PDF format), and a Java applet.

Simple Sudoku Solver - JavaScript brute force solver.

Sky One - Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.

SolveMySudoku.com - Browser-based puzzle solver.

Solving Sudoku - Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques.

Sudoku - Free daily puzzle with solution. Includes archive of past puzzles.

Sudoku - Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter.

Sudoku Addict - Offers printable grids and solution walkthroughs.

Sudoku enumeration - Several programs in different languages for analyzing possible Sudoku combinations.

Sudoku Fun Puzzles - A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.

The Sudoku Grandmaster - Self-styled Grandmaster offers tips on life as Sudoku, humorous
claims of achievement, and a daily puzzle.

Sudoku Helper - Free online helper application. Shows options for each square, and allows
backtrack, restart, or save.

Sudoku Master - Free daily grids that can be printed. Also offers solution and archive.

Sudoku Online - Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.

Sudoku Online Solver from friko.net - Free online generator, solver, and helper.

Sudoku Place - Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.

Sudoku Puzzles - Offers four difficulty levels. The puzzles can be solved online or downloaded as a PDF file.

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.

Sudoku.li - History, instructions, variants and puzzles in four difficulty levels (PDF format).

Sudoku-san - Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase.

SudokusWeb.com - Free daily printable Sudokus. Also offers history, rules, and solving techniques.

The Times - Articles and puzzles from The Times (London).

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.

Vegard Hanssen's page - Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum.

Wikipedia: Sudoku - An encyclopedia entry describing the rules, history, strategies and varients of Sudoku.

9x9, 6x6 and Samurai Sudoku - Offers classic Sudoku and variants, as well as an online solver.

Yosmany.net - Offers HTML to add a JavaScript-based puzzle to any site. My Days Are Numbered - An article by Seth Stevenson offering a brief overview of Sudoku.

The Economist: Do you sudoku? - Article on the puzzle's popularity in the United Kingdom and elsewhere.

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.

The Guardian: Sudoku fever grips UK newspaper readers - By Stephen Brook. Article covers how the UK craze got started.

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.

Links courtesy of dmoz.org.