https://www.abcya.com/games/decoder_puzzle

This is a fun secret code activity for students in lower primary. Students come up with their own secret message and type it into the box. The program will encode their secret message. Another student will be given the encoded message and the code to solve what the original secret message is. This is a fun and engaging way to introduce students to codes and how computers can convey information and represent data. Students can then be introduced to different codes and different ways of representing data.