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2. 20 Printable Sudoku Puzzles to Test Your Smarts - AOL

   www.aol.com/lifestyle/15-printable-sudoku...

   The post 20 Printable Sudoku Puzzles to Test Your Smarts appeared first on Reader's Digest. You want to start with the easy ones, but if you're an expert, you can skip to the extra hard puzzles.

3. Mathematics of Sudoku - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_Sudoku

   The general problem of solving Sudoku puzzles on n 2 ×n 2 grids of n×n blocks is known to be NP-complete. [8] A puzzle can be expressed as a graph coloring problem. [9] The aim is to construct a 9-coloring of a particular graph, given a partial 9-coloring. The Sudoku graph has 81 vertices, one vertex for each cell.

4. Sudoku - Wikipedia

   en.wikipedia.org/wiki/Sudoku

   The Times offers a 12×12-grid "Dodeka Sudoku" with 12 regions of 4×3 squares. Dell Magazines regularly publishes 16×16 "Number Place Challenger" puzzles (using the numbers 1–16 or the letters A-P). Nikoli offers 25×25 "Sudoku the Giant" behemoths. A 100×100-grid puzzle dubbed Sudoku-zilla was published in 2010. [20]

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

6. Play Sudoku Online for Free - AOL.com

   www.aol.com/games/play/masque-publishing/sudoku

   Sudoku. Completely fill the 9x9 grid, using the values 1 through 9 only once in each 3x3 section of the puzzle. By Masque Publishing

7. Web Sudoku - Wikipedia

   en.wikipedia.org/wiki/Web_Sudoku

   Web Sudoku is an online sudoku website which was rated as one of the best 50 fun and games website by Time. [1] It was founded by Gideon Greenspan and Rachel Lee. [ 2 ] The website was rated as the 7265th best website in the world by Jonathan Harchick in his book The World's Best Websites . [ 3 ]

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9. Sudoku solving algorithms - Wikipedia

   en.wikipedia.org/wiki/Sudoku_solving_algorithms

   A typical Sudoku puzzle. A standard Sudoku contains 81 cells, in a 9×9 grid, and has 9 boxes, each box being the intersection of the first, middle, or last 3 rows, and the first, middle, or last 3 columns. Each cell may contain a number from one to nine, and each number can only occur once in each row, column, and box.