Big Brain Teasers Book for Kids is perfect for ages 9 - 12 and up. This book was created to provide fun mental exercises that boost brain power, cultivate problem solving skills and promote critical thinking abilities. Included are long time family favorite mind teasers such as hidden pictures, cryptograms, math squares, logic grid puzzles and matchsticks. Also included are cool Japanese puzzles like sudoku, maysu and numberlink. This book appeals to parents and children who are needing some screen-free fun time.