Will Shortz Presents the Puzzle Doctor: KenKen Mania: 150 Easy to Hard Logic Puzzles That Make You Smarter

The country is in the grips of KenKen Mania! Luckily, the next title in our "Puzzle Doctor Presents" series is sure to satisfy the most addicted KenKen fan.

* Contains 150 puzzles ranging from easy to hard

* Puzzles range in size from 3x3 to 9x9 grids

* Introduction by Will Shortz