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2. 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

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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.

4. Free Online Puzzle Games - No Downloads - AOL.com

   www.aol.com/games/puzzle

   Play free online Puzzle games and chat with others in real-time and with NO downloads and NOTHING to install.

5. Sudoku - Wikipedia

   en.wikipedia.org/wiki/Sudoku

   A Sudoku puzzle can be expressed as a graph coloring problem. [31] The aim is to construct a 9-coloring of a particular graph, given a partial 9-coloring. The fewest clues possible for a proper Sudoku is 17. [32] Tens of thousands of distinct Sudoku puzzles have only 17 clues. [33]

6. 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.

7. 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.

8. Sudoku code - Wikipedia

   en.wikipedia.org/wiki/Sudoku_code

   Diagonal regions instead of square sub-grids can be used for performance investigations. [2] The diagonal sudoku has the advantage, that its size can be chosen more freely. Due to the sub-grid structure normal sudokus can only be of size n², diagonal sudokus have valid solutions for all odd . [2] Sudoku codes are non-linear.

9. Hidato - Wikipedia

   en.wikipedia.org/wiki/Hidato

   Numbrix puzzles, which appear in Parade magazine, are similar to Hidato except diagonal moves are not allowed. [9] (vos Savant has only used 7×7 and 9×9 grids). [10]Jadium puzzles (formerly Snakepit puzzles), created by Jeff Marchant, are a more difficult version of Numbrix with fewer given numbers and have appeared on the Parade web site regularly since 2014, along with a daily online ...