The Little Book of Number Chains is a fantastic - and highly addictive - new addition to our range of puzzle titles. It contains pages of chains designed to keep your brain active and entertained, whether on a journey, in a spare five minutes or on rainy days. The number chains are divided into levels of difficulty, from easy, to moderately hard and then on to more complex conundrums - and you can make it even harder on yourself by timing how long each takes to complete. All answers are contained at the back of the book so you can test your progress along the way. With this book, you'll find your mental maths comes on in leaps and bounds as you confront each new puzzle.