Game Mastering a Pervasive Larp. Experiences from Momentum

Runtime Game Mastering is a powerful tool in steering a pervasive game according to an artistic vision, while yet it enables ample opportunities for participant improvisation and initiative. A game mastered game can be collaboratively created by the designers and the participants. In this article, we discuss how game mastering was realized in Momentum; a pervasive Larp which seamlessly blended reality and fiction into a consistent and coherent whole. We discuss a number of techniques that were used and how they influenced the game.