Will Shortz Presents KenKen Easy to Hard Volume 3: 100 Logic Puzzles That Make You Smarter

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KenKen can be described simply as sudoku with basic math (addition, subtraction and/or multiplication and division). It's a fun, addictive, clever puzzle that's winning fans the world over. Already more than one million KenKen books have been sold in Japan and is a huge hit in The...