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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. [27] 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. [28] Tens of thousands of distinct Sudoku puzzles have only 17 clues. [29]
They occasionally stream puzzle games on YouTube. The channel was set up in 2017 by two friends from England: Simon Anthony, a former investment banker, and Mark Goodliffe, a financial director. [ 5 ] [ 6 ] Anthony is a former member of the UK's world sudoku and world puzzle championship teams, while Goodliffe is a 13-time winner of the Times ...
Sudoku. Completely fill the 9x9 grid, using the values 1 through 9 only once in each 3x3 section of the puzzle. By Masque Publishing
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.
Thomas Snyder (born c. 1980) [1] is an American puzzle creator and world-champion sudoku and logic puzzle solver. He is the first person to win both the World Sudoku Championship (3 times) and the World Puzzle Championship. Snyder writes a puzzle blog as Dr. Sudoku. [2]
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.
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 ...
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