Will Shortz is to puzzles what Oprah is to books an endorsement by the New York Times crossword editor is as good as gold. He helped popularize Sudoku in the U.S. and has sold more than 5 million volumes of the number-sequencing game. Now he's moved on to another numerical brainteaser, KenKen, which boasts something Sudoku does not: actual math. The game was invented by a teacher in Tokyo to help kids learn arithmetic; kenken means "cleverness squared" in Japanese.
"I'm a pretty busy guy, and I don't solve many puzzle books anymore, certainly not from start to...
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