Creating secret messages is always tons of fun. Check out these secret codes for kids that involve number cyphers

Express your feelings with secret codes if you find using letters too awkward👍 #forucrush

Learn binary code, decode a binary code message with the ASCII binary code alphabet and grab a free binary code workbook!

Analyze five clues each a 4 digit code with hints on right digit and right place in the code to find the 4 digit code that will open the number lock.

code 39 barcode characters -- how barcodes work - wikipedia

Morse code, pigpen, phonetic alphabet, tap code, substitution ciphers, American sign language: fun secret spy codes for kids