Sudoku, or Su Doku, is the name for a maddeningly addictive Japanese number logic puzzle which has become a bona fide craze in the United States during the past few months. The rules are simple. There is a nine-by-nine grid composed of nine three-by-three boxes. Some numbers are already filled in to a few of the 81 squares. The goal is to fill in all the squares so that each row, column and box contains the numbers 1 through 9 only once.
1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9
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