Is KenKen the Next Sudoku?

Part jigsaw puzzle, part math test, KenKen began as a game for 8-year-olds, but adults are horning in

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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