This educational game on musical themes familiarises the players with the phenomenon of the glissando, and makes it possible to compose one’s own music pieces made up of glissandi. Glissando is a fluid transition between two sounds differing in pitch. While playing with the app, we can form glissandi in a simple, intuitive manner. We can freely determine their beginnings and ends, their inclination and durations in sound space. The app also makes it possible to superimpose glissandi on one ano