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- Christiaan Olie - - Personal page describing Sudoku, rules, strategies, and offering puzzles to print. [Dutch/English.
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- 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.
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- Daily Sudoku - - Offers a different printable puzzle each day. Also includes solutions and FAQ.
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- Dan Rice's Sudoku Blog - - Blog discussing techniques for creating and solving puzzles, including hard puzzles. Also offers a daily puzzle.
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- Fundoku - - Randomly generated puzzles at three difficulty levels.
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- Gaby Vanhegan - - Daily and random puzzles at six difficulty levels, Flash and JavaScript solvers, solving techniques and glossary of terms.
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- Grant Gibson - - Offers syndicated puzzles for websites as well as print publications.
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- Hirofumi Fujiwara's Sudoku - - Offers a tutorial for creating puzzles, a Java-based solver, and links to other resources. [English/Japanese.
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- Information For Beginners - - Collection of printable grids, ordered by difficulty level. Solutions provided. Includes rules and solving methods.
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- Knight Features - - Publishing syndicate in the UK and Ireland. Offers several variations, including classic, colour, kids, and Sudoku Word.
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- Maths Is Fun - - Offers a number of applications and solvers for a variety of platforms. Also offers custom puzzles.
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- 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.
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- Nikoli - - From the company that introduced the game to Japan in 1984. Description, history, tutorial, and instructions on constructing custom puzzles.
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- Prize Sudoku - - Offers competitions for prizes. Traditional Sudoku, Godoku (letters) and Super Sudoku (16x16).
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- Puzzle Bus - - Offers a daily puzzle, books, software, and related merchandise. Also offers puzzles for syndication.
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- Puzzle Japan - - Offers tutorial, downloadable puzzles (PDF format), and a Java applet.
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- Sky One - - Information on UK-based cellular provider's world-record largest Sudoku puzzle and accompanying contest.
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- Solving Sudoku - - Step by step guide to solving sudoku puzzles. Goes from basic to advanced techniques.
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- Sudoku - - Free daily puzzle with solution. Includes archive of past puzzles.
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- Sudoku - - Provides sudoku puzzles in easy, medium and hard levels with their solutions. Also provides facility for daily email sudoku newsletter.
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- Sudoku Addict - - Offers printable grids and solution walkthroughs.
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- Sudoku enumeration - - Several programs in different languages for analyzing possible Sudoku combinations.
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- Sudoku Fun Puzzles - - A website representation of Sudoku, the broad sheet newspaper puzzle imported from Japan. Leaderboard lets players compare completion times.
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- The Sudoku Grandmaster - - Self-styled Grandmaster offers tips on life as Sudoku, humorous claims of achievement, and a daily puzzle.
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- Sudoku Helper - - Free online helper application. Shows options for each square, and allows backtrack, restart, or save.
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- Sudoku Master - - Free daily grids that can be printed. Also offers solution and archive.
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- Sudoku Online - - Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
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- Sudoku Place - - Offers daily puzzle in PDF format. Includes archive, FAQ, and a "dozen" variant.
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- 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.
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- 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.
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- Sudoku.li - - History, instructions, variants and puzzles in four difficulty levels (PDF format). [German/French/English/Spanish/Italian.
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- Sudoku-san - - Free daily puzzles with four difficulty levels. Also offers a solving assistant and downloadable e-book collections for purchase.
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- SudokusWeb.com - - Free daily printable Sudokus. Also offers history, rules, and solving techniques. [English/Spanish/French/Catalan/German/Portuguese.
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- The Times - - Articles and puzzles from The Times (London).
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- 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.
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- Vegard Hanssen's page - - Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English.
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- Wikipedia: Sudoku - - An encyclopedia entry describing the rules, history, strategies and varients of Sudoku.
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- Yosmany.net - - Offers HTML to add a JavaScript-based puzzle to any site. [English/Spanish.
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- My Days Are Numbered - - An article by Seth Stevenson offering a brief overview of Sudoku. (May 31, 2005)
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XML Feeds:- The Daily Sudoku - - Today's daily Sudoku puzzle from www.dailysudoku.co.uk. [RSS.
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