As an attempt at bridge-building between the open structure of games and the closed structure of stories, the concept of quests has been proposed by Ragnhild Tronstad (2001), Espen Aarseth (2004b), and Susana Tosca (2003). Quests in games can actually provide an interesting type of bridge between game rules and game fiction in that the game can contain a predefined sequence of events that the player then has to actualize or enact.