Independently Published Secret Code Breaking Puzzles for Kids: Create and Crack 25 Codes and Cryptograms for Children aged 6 to 10. Great as a Gift for Junior Spies

This is cheaply made with lots of grammatical mistakes (even on the first page.) There are much better code/spy themed books for children available. I think this might be made by Amazon as it doesn’t have an advertised author and I had a similar experience with a cheap and rubbish children’s Ancient Egyptian activity book made by them.

Not suitable for the age they recommend. It is very difficult

Way toooo hard for my kids