# Directory of Sudoku Resources

Created as "Number Place" in the 1970s, this logic puzzle gained mass popularity in Japan in the 1980s. "Sudoku", or "Su Doku", is Japanese for "number singly." In 2005 it gained great appeal in the United Kingdom and is rapidly expanding to the rest of the Western Hemisphere. The aim of the puzzle is to place a number from 1-9 in every square in the grid so that every row, column and 3x3 "region" includes each number once only. While numbers are most often used, this is only for simplicity. No math is required, only logic. There are also variants using letters or symbols, different-sized grids, overlapping grids, and other variations.

## Resources in This Category

• #### 7Sudoku

http://www.7sudoku.com/
Single daily Sudoku puzzle, 5 different levels (easy to very difficult), playable online (Flash required) and printable to PDF.

• #### 9x9, 6x6 and Samurai Sudoku

http://www.sudoku.4thewww.com/
Offers classic Sudoku and variants, as well as an online solver.

• #### BBC News: The puzzling popularity of Su Doku

http://news.bbc.co.uk/2/hi/uk_news/magazine/4469719.stm
Article by Paula Dear. Covers history in Japan and the UK and compares to the Rubik's cube craze of the 80s.

• #### Cluemaster Sudoku

http://www.sudoku.org.uk/
Daily Sudoku, Jigsaw, and Killer puzzles. Interactive Sudoku solver/teacher and tutorials.

• #### Daily SuDoku

http://www.dailysudoku.co.uk/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.com

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

• #### Free Printable Sudoku Puzzles

http://www.printable-sudoku-puzzles.com/
Easy printing of 6 sudokus per page.

• #### Free-Sudoku.org

http://www.free-sudoku.com/
Clean site with many puzzles at all levels, solvable online.

• #### Freedoku

http://en.freedoku.net/
Free online sudoku. Offers online game on 5 difficulty levels, changeable skins and printing up to 4 sudoku boards on one sheet of paper.

• #### GASP Sudoku

http://gaspmobilegames.com/sudoku/desc.htm
Solve Sudokus online. With explanation of some common solving strategies.

• #### Hirofumi Fujiwara's Sudoku

http://www.pro.or.jp/~fuji/index-eng.html
Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese]

• #### internetSudoku

http://internetsudoku.net/
solve Sudoku puzzles online, 5 levels, clean interface

• #### Planet Sudoku

http://planetsudoku.com/
Site with a very large number of puzzles and variants (4x4...25x25, Multi 2, Multi 4, Samurai Sudoku, etc.). Beginner to expert, solving engine, training aids, and "app-like" user interface.

• #### Play Sudoku

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

• #### Printable Sudoku Puzzles

http://www.sudoku9981.com/sudoku-puzzles
Offers five difficulty levels.For each sudoku ,You can print with normal and candidate mode.

• #### PrintMySudoku

http://www.printmysudoku.com/

• #### Prize Sudoku

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

• #### Puzzle Bus

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

• #### Skill Sudoku

http://skillsudoku.com/
solve Sudoku puzzles online, 3 levels, interface a bit clunky

• #### Smarter Sudoku

http://www.smartersudoku.com/
A scratch pad to help you fill in a Sudoku puzzle. You still have to solve it yourself. Every day, you get three fresh Sudokus.

• #### Solve My Sudoku

http://www.solvemysudoku.com/
Solves puzzles based on inputted information.

• #### Solving Sudoku

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

• #### Sudoku

http://www.sudokutoday.com/
Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter.

• #### Sudoku

http://www.sudoku.name/

• #### Sudoku

http://www.sudoku.ws/
Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.

• #### Sudoku

http://www.calcudoku.org/sudoku
Two daily sudoku puzzles (easy and medium), printable and solvable online.

• #### Sudoku

http://www.sudoku.li/?lang=en
Sudoku information and downloadable puzzles (PDF) in four levels and five languages (English, Spanish, German, French, Italian).

• #### Sudoku 9981

http://www.sudoku9981.com/
Solve Sudoku online, download printable puzzles at all levels, descrptions of strategies. Windows programs for solving and printing Sudoku, and for solving Samurai Sudoku.

• #### Sudoku As

http://www.sudoku-as.com/
Sudoku solver. Offers free puzzles at 3 levels of difficulty (easy, normal, hard) and a practical stopwatch.

• #### Sudoku enumeration

http://www.afjarvis.staff.shef.ac.uk/sudoku/
Several programs in different languages for analyzing possible Sudoku combinations.

• #### Sudoku Generator and Solver

http://sudoku.becher-sundstroem.de/
Sudoku generator, editor, solver. User registration and rankings.

• #### Sudoku Island

http://sudokuisland.com/
Online sudoku solving with a very clean interface.

• #### Sudoku of the Day

http://sudokusoftheday.blogspot.de/
Blog with 5 sudoku puzzles each day, from "very easy" to "extreme".

• #### Sudoku Online Solver

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

• #### Sudoku Place

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

• #### Sudoku Puzzle - Sudoque

http://sudoque.com/play
Solve Sudoku online with a very clean interface.

• #### Sudoku Puzzler

http://www.sudokupuzzler.com/
Free, daily Sudoku puzzles to print or play online.

• #### Sudoku Puzzles

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

• #### Sudoku Puzzles

http://isbooth.com/sudoku
Solve Sudoku puzzles online, with interface targeted to tablets.

• #### Sudoku XL

http://www.sudokuxl.com/
4 levels of online playable Sudoku. Print up to 6 sudokus on one A4 sheet. Requires Flash.

• #### Sudoku-Puzzles.net

http://www.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]

• #### SuDokuMate

http://www.sudokumate.com/
A SuDoku helper (not a solver) that replaces pencil and paper to aid solving.

• #### SudokusWeb

http://www.sudokusweb.com/
Free daily printable Sudokus. Also offers history, rules, and solving techniques.

• #### Sudoweb

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

• #### The Daily Sudoku

Today's daily Sudoku puzzle from www.dailysudoku.co.uk.

• #### The Guardian: So you thought Sudoku came from the Land of the Rising Sun...

http://www.theguardian.com/media/2005/may/15/pressandpublishing.usnews
Article by David Smith covering the puzzle's origins as "Number Place" by Dell Puzzle Magazine in New York in the 1970s.

• #### The Sudoku

http://the-sudoku.com/
solve Sudoku online, 5 levels

• #### Vegard Hanssen's page

http://www.menneske.no/sudoku/eng/
Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English]

• #### Wikipedia: Sudoku

http://en.wikipedia.org/wiki/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

http://www.wsc2006.com/
Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian]

• #### Yosmany.net

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

## Other Languages

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