By Cheryl Tan

A Singaporean based in the United States has won a national Sudoku contest there, beating 68 contestants in cracking the killer Japanese number puzzles.

The local brainbox, who won top prize in the third annual Sudoku National Championship in Philadelphia last Saturday, is Tammy McLeod, a 32-year-old computer programmer with search engine giant Google.

Apart from the coveted title, she also wins US$10,000 (S$14,000), an iPod Touch and a place to represent the United States at the 2010 World Sudoku Championship to be held again in Philadelphia next April.

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