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(Paperback)
Are you tough enough?
Tkae on this collection of 200 devilishly difficult KenKen puzzles!
TETSUYA MIYAMOTO, the creator of KenKen, is a math teacher whose use of KenKen in his classroom has proved so successful that it has lead to a worldwide demand for his puzzle to be published in book form.
WILL SHORTZ has been crossword editor of The New York Times since 1993. He is also the puzzlemaster on NPR’s Weekend Edition Sunday.
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November 15, 2009: These puzzles are very interesting but not for anyone pressed for time. I have become kind of bored/jaded with Sudoku and these Ken-Ken puzzles are a step above. I've done about 180 of them in the book and I will be sorry when I finish. I hope I can find more of this degree of difficulty.
Every one CAN BE SOLVED with logic alone. None of this Sudoku solution method of make a guess and see if it works. Just spend enough time thinking about it and things fall into place.