Will Shortz Presents Terrifying KenKen: 100 Very Hard Logic Puzzles That Make You Smarter

Are you up for the challenge? This collection of KenKen has the puzzles to put your solving skills to the test. So grab a pencil and see if you're a KenKen master.

Includes:

*100 fearsome KenKen puzzles

*Puzzles range in size from simple 3x3 grids to mind-bending 9x9 grids

* Introduction and solving instructions by puzzlemaster Will Shortz