Secret Codes

This book teaches you how to send secret messages to your friends or anyone else that no one else can understand. You only need to practise a little with the book's cryptographic codes: from Julius Caesar's cipher to shift codes and the fun encoding methods of the Boy Scouts. You can check whether you answered correctly with your electronic pen.

This book will test your intelligence and quick thinking! Test your detective skills through fun logical, intelligent and observational games and become a real detective. You can check whether you answered correctly with your electronic pen.