Iter is a 2D based music-rhythm game for smartphones. In the story, the player follows a traveller in order to explore the world, which has been torn apart by magic. In spite of the complicated story, Iter can be played by beginners; it is, however, explicitly suitable for professionals as well. A special feature increases the gaming fun: the so-called button stretch mechanism provides more variation and poses a proper challenge for the players. The graphics of this app are designed in harmonious colours.