New research shows that although the human brain is made up of about 75% water, it works like a muscle. It grows stronger when you practice your problem solving skills. One of the best ways for kids and adults to keep their minds sharp and fit is solving brain teaser puzzles. The large collection of logic puzzles in this book are like daily exercises for your brain. They start from easy to increasingly challenging. You can play them in a classroom, at a gathering with friends and family, or anywhere by yourself for hours of fun. Start your ultimate brain workout today to keep your mind in fantastic shape at any age.