The paper presents changes that occurred in social mentality after World War I. It shows the diminishing role of social conventions in social life and the evolution in the approach to children. It presents not only the kinds and forms of play and games suitable for children, high school and university students, but also their role in the process of education. Special attention is paid to the development of social and class consciousness. The article shows differences in the treatment of girls and boys and the changes occurring in this field. It classifies and describes particular kinds of games and social gatherings, and it emphasizes the most important moments in the life of a young man/woman showing his/her gradual entry into the adult world.