The Ultimate Code-Breaker's Puzzle Book: Over 50 Puzzles to Become a Super Spy, Crack Codes, and Train Your Brain! - Gareth Moore - Bog

"Kids will have a blast solving the awesome alphabet and number codes, grids and picture puzzles. Don't worry, if kids get stuck, there are tips and subtle clues to help improve code breaking skills. The more kids do, the better they will get. Full answers are tucked away, just to check the code has been cracked. With full-colour graphics and illustrations throughout, this book is as eye-catching as it is entertaining"--