The aim of the dissertation is the dessign of counter-spaces, namely the design of situations on already existing sites with predefined functions. For this purpose, a design methodology was developed based on gaming, not as an end result but rather as a design game where different forms of spaces arise that surround different actions and behaviors. Choosing three points of pedestrian traffic on a central avenue in Athens, the pedestrian bridge, the vertical channels and the pedestrian crossing the design was based on three of type of games, defined by Caillois as simulation, vertigo and competition. At each point a game type was applied, based on the data of each space, its use and its relationship to the central avenue.