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Sudoku, an addictive logic game, is a phenomenon all over the world.
You would imagine that, with a name like “Sudoku”, this game originated in Japan, but actually it has been around for many years in the UK. It caught on in Japan, where number puzzles are much more prevalent than word puzzles. (Crosswords don't work well in the Japanese language.)
This game is not a mathematical or arithmetical puzzle. It works just as well if the numbers are substituted with letters or some other symbols, but numbers work best.
The game consists of a 9x9 grid that has been subdivided in 9 smaller grids of 3x3 squares. Each puzzle has a logical and unique solution.
To solve the puzzle, each row, column and box must contain each of the numbers 1 to 9.
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