Not only are these puzzles fun but KenKen helps children improve concentration, logic and arithmetic skills. Children ages 9-12 have excelled in math and gained real-life problem solving skills all from playing a puzzle so engaging that it keeps them coming back for more. This second volume of I Can KenKen features: . 75 easy all multiplication puzzles to get kids excited about KenKen . Introduction and how to solve instructions from Marilyn Burns . Home and Classroom Guide for Parents and Teachers by Ms. Burns . Foreword by Will Shortz | Will Shortz Presents I Can KenKen Volume 2 by Tetsuya Miyamoto, Paperback | Indigo Chapters