Over 50 secret codes

Descriere

Over 50 secret codes

• Code-cracking skills can be put to the test in this entertaining book which teaches children how to write and decode secret messages.
• Includes Semaphore and Morse code, the Grid code used in the American Civil War, Egyptian hieroglyphics, number replacement and alphabet switching codes and more.
• Each page features a different type of code, with an explanation of how it works and a practice code to crack.
• All answers are available at the back of the book.