| 9x9, 6x6 and Samurai Sudoku: Offers classic Sudoku and variants, as well as an online solver. |
| 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. |
| Christiaan Olie: Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English] |
| 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. |
| Hirofumi Fujiwara's Sudoku: Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese] |
| 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. |
| My Days Are Numbered: An article by Seth Stevenson offering a brief overview of Sudoku. |
| 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. |
| 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. |
| 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. [English/French/Spanish/Polish] |
| 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. [English/German/French/Spanish/Dutch/Portuguese/Italian] |
| Sudoku-san: Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase. |
| 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). [German/French/English/Spanish/Italian] |
| SuDokuMate: SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving. |
| SudokusWeb.com: Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese] |
| 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. |
| The Heebie Su Doku Site: Offers a glossary of terms, links to puzzles and variants, and tips for solving. |
| The Sudoku Grandmaster: Self-styled Grandmaster offers tips on life as Sudoku, humorous claims of achievement, and a daily puzzle. |
| 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. [Norwegian/English] |
| 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. |
| World Sudoku Championship: Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian] |
| Yosmany.net: Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish] |
Classical
