Sudoku Brain Teasers Puzzles

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. There are also variants using letters or symbols, different-sized grids, overlapping grids, and other variations.

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• My Days Are Numbered - An article by Seth Stevenson offering a brief overview of Sudoku.
  
• Sudoku Puzzles - Free daily puzzles with five difficulty levels with their solutions. Also offers guide to solve Sudoku puzzles.
  
• The Heebie Su Doku Site - Offers a glossary of terms, links to puzzles and variants, and tips for solving.
  
• SuDokuMate - SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving.
  
• Sudoku Online Solver - Free online generator, solver, and helper. [English/French/Spanish/Polish]
  
• The Economist: Do you sudoku? - Article on the puzzle's popularity in the United Kingdom and elsewhere.
  
• 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.
  
• 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.
  
• Information For Beginners - Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.
  
• Dan Rice's Sudoku Blog - Weblog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle.
  
• Grant Gibson - Offers syndicated puzzles for websites as well as print publications.
  
• Solving Sudoku - Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques.
  
• Sky One - Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.
  
• Simple Sudoku Solver - JavaScript brute force solver.
  
• Sudoku Online - Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
  
• 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.
  
• SudokusWeb.com - Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese]
  
• Vegard Hanssen's page - Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English]
  
• The Guardian: Sudoku fever grips UK newspaper readers - By Stephen Brook. Article covers how the UK craze got started.
  
• Scanraid LTD Search Technologies - Sudoku Solver by Andrew Stuart. Shows the logic behind solving sample games square by square.
  
• pi-c-it Sudoku - Generates and solves classic and X-Sudoku problems. Diverse options and an integrated help facility.
  
• Sudoku enumeration - Several programs in different languages for analyzing possible Sudoku combinations.
  
• 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.
  
• 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.
  
• Daily Sudoku - Offers a different printable puzzle each day. Also includes solutions and FAQ.
  
• Solve My Sudoku - Solves puzzles based on inputted information.
  
• Sudoweb - Free daily puzzles with five difficulty levels. Also offers printable e-book.
  
• Knight Features - Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word.
  
• 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.
  
• Maths Is Fun - Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.
  
• World Sudoku Championship - Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian]
  
• Sudoku-san - Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase.
  
• The Times Sudoku - Daily sudoku and killer sudoku puzzles from The Times newspaper, London.
  
• Gaby Vanhegan - Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.
  
• Free Sudoku Puzzles - Offers a free javascript version of the sudoku game.
  
• SuDoKu-Cracker - Only creates puzzles with a "unique solution". The built-in generator has six different levels of difficulty and can generate many (millions) different puzzles. All puzzles can be printed, exported, saved and opened again.
  
• Sudoku Place - Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.
  
• Sudoku Addict - Offers printable grids and solution walkthroughs.
  
• Puzzle Bus - Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.
  
• Hirofumi Fujiwara's Sudoku - Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese]
  
• 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. [English/Spanish]
  
• 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.
  
• Prize Sudoku - Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
  
• Play Sudoku - Flash version of the Sudoku game. Also offers solution.
  
• Sudoku - History, instructions, variants and puzzles in four difficulty levels (PDF format). [German/French/English/Spanish/Italian]
  
  

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