Number Puzzle International Championship in Philadelphia
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by KYW's Hadas Kuznits
Sudoku players have converged on Philadelphia for an international competition this Friday and Saturday.
It might look more like an SAT exam than a contest, but people from all over the world are participating in the World Sudoku Championship in Philadelphia. That's the puzzle game (right) in which you have to fill in digits in a 9 x 9 grid according to certain rules.
Director Will Shortz (right):
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