Earlier writings on the political importance of play have discussed how it can make players conscious of the possibilities of otherwise worlds. Prefigurative politics has very similar aims, but the discussion between the two has been limited. In this article, I conceptualize prefigurative political forms of child mobility activism (i.e. mobility collectives, street experiments and demonstrations) as ludic spaces that prefigure children’s right to the mobile city. Here, play is not mere make-believe but based on real emotional stakes, appropriation of real spaces and creation of disruptive rhythms. After that, I show how the players use ludic spaces as the foundation for prefigurative organizing, but also that these processes are highly contextual and fragmented. Finally, I discuss how ludic spaces and other prefigurative political forms can be considered part of the radical cooperative notion of the right to the (mobile) city.