As virtual worlds and games grow in both personal and cultural importance, present limitations in access to them is increasingly limiting their ability to achieve their potential. Transmedial access, in which a given player's access to a game is made possible across different devices, offers a promising solution to this problem. It also inaugurates a new category of interaction design: transmedial interaction. This workshop explores the state of the art of transmedial interaction in games, which today unfortunately is often at most mere afterthought. It provides a participatory environment in which attendees can chart new paths forward, from developing viable business models and understanding the technical infrastructure to developing critical vocabularies and evaluative frameworks.