QR codes find a new use for themselves, acting as a tool for child development. What best develops abilities? A game! And decryption of encrypted two-dimensional "messages" is not a game? :)
The Dover Town library, Massachusetts, has developed a development program for children during the summer holidays with the active use of QR codes. The program is a sort of “Great Space Adventure”, in which children walk through the library and certain routes of the city and get acquainted with the model of the Solar System, saturated with codes that they can read to learn more about each object. Children can also create their own codes and use them as “alien messages” in games.