Press enter after choosing selection

Secret Codes #2

This time we are going to encode a message with a real codebook that you can view here:

It's called the Colorado Code (named for the river). As an example, if you were going to encode "Battalion headquarters being shelled", you would look at the first section of the codebook ("Encoding" starting on page 3), find "Battalion headquarters" with the corresponding code DMO, then find "Being shelled" with the corresponding code DAR. Both of these are on page 5. Put them together and you get DMODAR.

Hopefully, you'll never have to send or receive DAM (look on the front cover)!

Remember a code can substitute for single words, phrases, or even whole sentences. (We'll get to ciphers -- that manipulate letters -- soon enough!)


This badge has been awarded to 744 players

Sign in to see clues and check your progress on this badge


These are so fun, but this was hard to see even when I blew it up, can you send the codes?

So glad you are enjoying these! There won't be any more of this specific type of code, but there are 5 secret ciphers to figure out coming up in the next few weeks. Stay tuned to this badge series to try your hand at all of them.


★★★☆ 3 of out 4 difficulty

Badge Points

Back to