Readers young and old will love these fast-paced, fun-packed, fully illustrated books. They're packed with ingenious puzzles that will really get you thinking outside the box. With just a little daily mental exercise, you'll find that you're sharper, faster-and ready to tackle whatever head-scratching problems might come your way! The activities in this series range from classic riddles and code-cracking games to innovative visual puzzles.

Whether you choose to tackle these activities alone, or challenge friends and family, you'll have a real blast. Suitable for anyone aged 9 to 99.