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Sudoku is a logic-based number placement puzzle. It was invented in the U.S. in 1979 under the name "Number Place", and became popular in Japan in 1986, where it was dubbed Sudoku ("single number"). It then spread internationally in 2005. The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9. The puzzle creator provides a partially completed grid, and the player has to figure out the rest. Web Sudoku allows you to play with the puzzles online with your browser, rather than having to buy printed books of puzzles. And don't worry about running out of puzzles: based on the rules set forth, there are 6,670,903,752,021,072,936,960 possible puzzle grids.
From This is True for 16 September 2007
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