On a fun-filled journey into a full-color world of codes, encounter symbols that stand for words, numbers that replace letters, and even messages that are doubly encoded! Goofy illustrations and hilarious jokes add to the adventure. Make a code book, a secret cipher slide for creating letter substitution codes, and even invisible ink! Dozens of entertaining puzzle challenges, ranked by difficulty.
- ISBN10 0806908904
- ISBN13 9780806908908
- Publish Date 1 May 1995
- Publish Status Out of Print
- Out of Print 17 October 2001
- Publish Country US
- Imprint Sterling Juvenile
- Format Paperback
- Pages 64
- Language English