MakingCodesCodes are used whenever people want to keep a message private. You need to know how the code works and the person receiving your message needs to know how the code works too. Here are some online activities to practice making and breaking secret codes:

Code Books:

Spy Codes and Ciphers Breaking Secret Codest Destroy After Reading the World of Secret Codes Codes and Ciphers
Mysterious Messages Sly the Sleuth and the Code Mysteries
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