For most parts of your body, exercise is a wonderful thing. The brain is no different, and using this unique puzzle book could help you with concentration, memory and creative thinking. Give it the workout it deserves! Ranging from the mildly challenging to the very tough, How Big is Your Brain? is an interactive maze of riddles, enigmas and brainteasers, including codebreaking, number-crunching and logic conundrums, all there to test your mind to the limit. How big is your brain? Take the challenge and find out!