Secret Code Games for Clever Kids®: More than 100 puzzles to boost your brainpower (Buster Brain Games)
U.S.A. Secret Code Puzzles for Kids (Dover Kids Activity Books: U.S.A.)
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
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