Book excerpt: This title contains over 300 interactive number puzzles, codes and logic conundrums including a 16 page colour section. It is perfect for the 'New Year, New You' market - discover whether your brain is the size of a pea or the size of a planet! Like the rest of your body, your brain needs to sweat and stretch to improve. Give it the workout it deserves with this interactive book, and develop your concentration, memory and creative thinking! Ranging from the mildly challenging to the almost impossible, each puzzle directs you to another when completed - depending on whether or not you got the first one right! It's a fiendish interactive maze of riddles, enigmas and fanciful brainteasers, including code-breaking, number-crunching and logic conundrums, all there to test your mind to the limit. With over 200 puzzles, "How Big is Your Brain" can be endlessly replayed to improve your mind - and a brain-boosting score. How big is your brain? - take the challenge and find out!