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Completely fill the 9x9 grid, using the values 1 through 9 only once in each 3x3 section of the puzzle. By Masque Publishing
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.
A Sudoku puzzle can be expressed as a graph coloring problem. [30] 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. [31] Tens of thousands of distinct Sudoku puzzles have only 17 clues. [32]
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]
Daily Sudoku puts a whole new twist on the classic game you know and love! Play for score as you enter numbers with the clock ticking away, but don't guess or you'll lose points and the Perfect Bonus!
The analysis of Sudoku is generally divided between analyzing the properties of unsolved puzzles (such as the minimum possible number of given clues) and analyzing the properties of solved puzzles. Initial analysis was largely focused on enumerating solutions, with results first appearing in 2004. [1] For classical Sudoku, the number of filled ...
Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) 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, however, can take hours to solve.
Sudoku puzzles also constrain square blocks of cells to contain each number once, making a restricted type of Latin square called a gerechte design. [ 1 ] Chapters four and five concern the combinatorial enumeration of completed Sudoku puzzles, before and after factoring out the symmetries and equivalence classes of these puzzles using Burnside ...
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