In this paper we explore how mobile devices and co-location in mobile contexts contribute social play in game design, addressing the limited understanding of social interactivity in mobile games. Using the Mechanics-Dynamics-Aesthetics (MDA) framework, we code four games illustrating effective use of mobile, social, and co-located elements. Subsequently, we analyse and discuss this data to identify generalisability in these games. In our discussion we identify how these findings address game design problems of designing collaborative games. Furthermore, we contribute to theory of designing for social play from the perspectives of co-located mobile contexts in game design by identifying how mobility: (1) affords co-locating with other players in public spaces, (2) supports physical interactions using spatial context and players bodies, extending games beyond their formal system, (3) supports asymmetric design with information and interaction. Finally we contribute the concept of a pocket magic circle, a particular magic circle, to support a focus on game design leveraging these intersecting properties.
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