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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.
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SudokusWeb - Free daily printable Sudokus. Also offers history, rules, and solving techniques. 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] World Sudoku Championship - Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian] Cluemaster Sudoku - Daily Sudoku, Jigsaw, and Killer puzzles. Interactive Sudoku solver/teacher and tutorials. 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. Hirofumi Fujiwara's Sudoku - Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese] Vegard Hanssen's page - Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English] Solving Sudoku - Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques. Sudoku Place - Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant. The Daily Sudoku - Today's daily Sudoku puzzle from www.dailysudoku.co.uk. Sudoku Online Solver - Free online generator, solver, and helper. [English/French/Spanish/Polish] Daily-Sudoku.com - Offers a different printable puzzle each day. Also includes solutions and FAQ. Yosmany.net - Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish] 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. 9x9, 6x6 and Samurai Sudoku - Offers classic Sudoku and variants, as well as an online solver. Sudoku - Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter. Solve My Sudoku - Solves puzzles based on inputted information. Sudoweb - Free daily puzzles with five difficulty levels. Also offers printable e-book. Play Sudoku - Flash version of the Sudoku game. Also offers solution. Sudoku Puzzles - Free daily puzzles with five difficulty levels with their solutions. Also offers guide to solve Sudoku puzzles. Sudoku enumeration - Several programs in different languages for analyzing possible Sudoku combinations. Freedoku - Free online sudoku. Offers online game on 5 difficulty levels, changeable skins and printing up to 4 sudoku boards on one sheet of paper. Sudoku Puzzler - Free, daily Sudoku puzzles to print or play online. Printable Sudoku Puzzles - Offers five difficulty levels.For each sudoku ,You can print with normal and candidate mode. Free Printable Sudoku Puzzles - Easy printing of 6 sudokus per page. Sudoku As - Sudoku solver. Offers free puzzles at 3 levels of difficulty (easy, normal, hard) and a practical stopwatch. Sudoku - Play sudoku puzzles online for free. Sudoku - Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods. 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. Sudoku XL - 4 levels of online playable Sudoku. Print up to 6 sudokus on one A4 sheet. Requires Flash. 7Sudoku - Single daily Sudoku puzzle, 5 different levels (easy to very difficult), playable online (Flash required) and printable to PDF. 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. GASP Sudoku - Solve Sudokus online. With explanation of some common solving strategies. Planet Sudoku - 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. Sudoku Generator and Solver - Sudoku generator, editor, solver. User registration and rankings. PrintMySudoku - Many printable sudokus downloadable as PDF. New ones generated often. Sudoku Island - Online sudoku solving with a very clean interface. Sudoku 9981 - Solve Sudoku online, download printable puzzles at all levels, descrptions of strategies. Windows programs for solving and printing Sudoku, and for solving Samurai Sudoku. Free-Sudoku.org - Clean site with many puzzles at all levels, solvable online. Sudoku Puzzles - Solve Sudoku puzzles online, with interface targeted to tablets. Sudoku - Two daily sudoku puzzles (easy and medium), printable and solvable online. Smarter Sudoku - 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. 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. SuDokuMate - A SuDoku helper (not a solver) that replaces pencil and paper to aid solving. Sudoku Puzzle - Sudoque - Solve Sudoku online with a very clean interface. Sudoku of the Day - Blog with 5 sudoku puzzles each day, from "very easy" to "extreme". Sudoku - Sudoku information and downloadable puzzles (PDF) in four levels and five languages (English, Spanish, German, French, Italian). internetSudoku - solve Sudoku puzzles online, 5 levels, clean interface The Sudoku - solve Sudoku online, 5 levels Skill Sudoku - solve Sudoku puzzles online, 3 levels, interface a bit clunky
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