Su Doku's beginnings and How to play it

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Su Doku orginally came from Japan. In fact, the words mean "single number" in Japanese. In 1997 Wayne Gould, aformer Hong Kong judge, found a Su Doku puzzle book when he visited Japan. Gould worked for six years on a computer program to produce Su Doku puzzles instantly. He introduced the program to many British newspapers. And on November 12, 2004, Su Doku appeared for the first time in The Times in London. Today, Su Doku also appears in American and Asian newspaper. Su Doku is a grid of 81 boxes, divided into nine three-by-three squares. Some boxes have a number between 1 and 9 filled in. The goal is to fill the remaining rows and columns with the numbers 1 through 9. But the numbers 1 through 9 cannot be repeated on each row, column and three-by-three square.