Children love to learn secret codes and write encrypted messages and this book will teach them everything they need to know, including Semaphore and Morse code, Grid code (used in the American Civil War), Egyptian hieroglyphics and traditional number replacement and alphabet switching codes.

All Editions

Paperback, 4th Edition

ISBN13: 9781409584612

Usborne, 2015

Share Your Thoughts

Your review helps others make informed decisions

Click on a star to start your review