Will Shortz Presents Ferocious Kenken

　　Are you tough enough?

　　Tkae on this collection of 200 devilishly difficult KenKen puzzles!

作者簡介

　　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.