OnStage is the RoboCupJunior competition that leaves the most room for constructing robots and designing a performance. Based on a choreography specially created by the team, the self-constructed robots move to the music. Most teams have several robots dance to their own music. Some teams tell a whole story with their robots and also bring themselves into their little play.

An expert jury assesses in particular the complexity of the robots, their programming, the originality of the idea and the technical implementation. In a further presentation, the team explains to the audience the technical background of the robots, which can not be seen in the performance at first glance.