A game is best evaluated by playing it and prototyping is therefore an important activity in game development. Game writers and narrative designers are responsible for the narrative structure of a game, which may have a varying degree of interactivity to it. The aim of this paper is to analyse the role of prototyping tools for game writers. There is a limited range of such tools available, of which Twine is one of the most established. Most of these tools have a text-based programming interface for modelling of game mechanics. This paper presents Deig—a proto- typing tool for creating point-and-click adventure games. In Deig, game mechanics is modelled graphically using nodes from a set of primitives. We present an interview study where game writing students reflect on their experience of using Deig and Twine as prototyping tools. The result shows that both tools have their merits and complement each other. Deig was found to be intuitive for modelling of game mechanics, which lead students to create interactive narratives. Twine was found to be more useful for experimental writing. The conclusion of this work is that there is a need for a diverse set of prototyping tools to support game writing.