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 ... [MORE] Browser Based@ (28) Chats & Forums (3) Software (20) Variants (5) 1. 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. 2. Christiaan Olie - Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English] 3. 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. 4. Dan Rice's Sudoku Blog - Blog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle. 5. Hirofumi Fujiwara's Sudoku - Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese] 6. Information For Beginners - Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods. 7. Knight Features - Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word. 8. Maths Is Fun - Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles. 9. 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. 10. Simple Sudoku Solver - JavaScript brute force solver. 11. Solving Sudoku - Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques. 12. Sudoku Addict - Offers printable grids and solution walkthroughs. 13. Sudoku enumeration - Several programs in different languages for analyzing possible Sudoku combinations. 14. Sudoku Fun Puzzles - A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times. 15. Sudoku Helper - Free online helper application. Shows options for each square, and allows backtrack, restart, or save. 16. Sudoku Master - Free daily grids that can be printed. Also offers solution and archive. 17. Sudoku Online Solver from friko.net - Free online generator, solver, and helper. [English/French/Spanish/Polish] 18. Sudoku Place - Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant. 19. 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] 20. Sudoku-san - Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase. 21. Sudoku.li - History, instructions, variants and puzzles in four difficulty levels (PDF format). [German/French/English/Spanish/Italian] 22. SudokusWeb.com - Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese] 23. The Economist: Do you sudoku? - Article on the puzzle's popularity in the United Kingdom and elsewhere. 24. 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. 25. The Guardian: Sudoku fever grips UK newspaper readers - By Stephen Brook. Article covers how the UK craze got started. 26. The Sudoku Grandmaster - Self-styled Grandmaster offers tips on life as Sudoku, humorous claims of achievement, and a daily puzzle. 27. The Times - Articles and puzzles from The Times (London). 28. 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. 29. Vegard Hanssen's page - Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English] 30. 9x9, 6x6 and Samurai Sudoku - Offers classic Sudoku and variants, as well as an online solver. 31. Daily Sudoku - Offers a different printable puzzle each day. Also includes solutions and FAQ. 32. Flying Frog Consultancy - This web page describes a 19-line (769-byte) OCaml program that solves Sudoku puzzles. 33. Fundoku - Randomly generated puzzles at three difficulty levels. 34. Gaby Vanhegan - Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms. 35. Grant Gibson - Offers syndicated puzzles for websites as well as print publications. 36. My Days Are Numbered - An article by Seth Stevenson offering a brief overview of Sudoku. 37. NodeWorks Encyclopedia: 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. 38. Prize Sudoku - Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16). 39. Puzzle Bus - Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication. 40. Sky One - Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest. 41. SolveMySudoku.com - Browser-based puzzle solver. 42. Sudoku - Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter. 43. Sudoku - Free daily puzzle with solution. Includes archive of past puzzles. 44. Sudoku Online - Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle. 45. 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. 46. SuDokuMate - SuDokuMate is a SuDoku Helper (not a Solver) that replaces pencil and paper to aid solving. 47. The Heebie Su Doku Site NEW! - Offers a glossary of terms, links to puzzles and variants, and tips for solving. 48. World Sudoku Championship - Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian] 49. Yosmany.net - Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish]

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