- Daily SuDoku
 - Download and print a puzzle every day. - Daily Telegraph: Sudoku
- The newspaper's site for the addictive puzzle game includes help files, news articles, and other Su Doku fun.
- Number Logic: Sudoku
- Offers a variety of Sudoku puzzles to play online. Choose between easy, medium, hard, and impossible puzzles.
- Speed Sudoku
- Play fast-paced Sudoku races online for free.
- Su Doku Solver
- Just in case you get stuck.
- Su Doku Work Pad & Solution
- Microsoft Excel workbook which gives puzzlers a work pad to jot down possible grid values when solving SuDoku challenges.
- SuDoku
- Logic puzzle in which the player must fill in a grid so that every row, every column, and every 3x3 box contains the digits 1 through 9.
- Sudoku Classic
- Daily Sudoku puzzles from The Guardian.
- Sudoku Craving
- Offers players new sudoku challenges daily, along with recorded stats.
- Sudoku Fun
- Offers a new puzzle every day, as well as a speed challenge.
- Sudoku Kingdom
- Provides Sudoku puzzles for printing, or to play online. Select a puzzle by difficulty level, time constraints, or simply print out a puzzle to take with you on a trip.
- Sudoku Online
- Offers online version of the popular logic puzzle Sudoku. Features various game modes like easy, medium, and hard.
- Sudoku Programmers
- Forum dedicated to the puzzle game SuDoku. Discuss techniques for solving and creating puzzles.
- Sudoku Solver
- Free utility for quickly solving Sudoku problems.
- Sudoku129
- Daily SuDoKu, printable custom puzzle booklets, downloadable software, tips, and history. Also in French.
- Wikipedia: Sudoku
- Hyperlinked article on the number placement puzzle.
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