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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. File:4x4 shapes sudoku puzzle.pdf - Wikipedia

   en.wikipedia.org/wiki/File:4x4_shapes_sudoku...

   The following other wikis use this file: Usage on en.wikibooks.org Wikijunior:Maze and Drawing Book; Wikijunior:Maze and Drawing Book/Print version

4. File:Sudoku puzzle hard for brute force.svg - Wikipedia

   en.wikipedia.org/wiki/File:Sudoku_puzzle_hard...

   English: A Sudoku that is difficult to be solved by a brute force algorithm. It can still be easily solved with elementary pen and paper methods alone. It can still be easily solved with elementary pen and paper methods alone.

5. Killer sudoku - Wikipedia

   en.wikipedia.org/wiki/Killer_Sudoku

   Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunanpure サムナンプレ sum-num(ber) pla(ce)) is a puzzle that combines elements of sudoku and kakuro. Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic ; the hardest ones ...

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. Free Online Games: Play board games, card games, casino games ...

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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.

8. 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.

9. Mathematics of Sudoku - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_Sudoku

   For classical Sudoku, the number of filled grids is 6,670,903,752,021,072,936,960 (6.671 × 10 21), which reduces to 5,472,730,538 essentially different solutions under the validity-preserving transformations. There are 26 possible types of symmetry, but they can only be found in about 0.005% of all filled grids. An ordinary puzzle with a ...