This lecture, which I presented together with Harvey Smith at the GDC 2010, examines the game environment as a narrative device, with a focus on further involving the player in interpreting (or pulling) information, in opposition to traditional fictional exposition. Harvey and I provide an analysis of how and why some games in particular create higher levels of immersion and consistency, and we propose ways in which dynamic game systems can be used to expand upon these techniques. The lecture presents the techniques for environmental storytelling, the key to the creation of game spaces with an inherent sense of history; game spaces that invite the player’s mind to piece together implied events and to infer additional layers of depth and meaning. In addition to commonly-used environmental storytelling tools (such as props, scripted events, texturing, lighting and scene composition), we present ideas for using game systems to convey narrative through environmental reaction. Environmental storytelling engages the player as an active participant in narrative; game systems that reflect the player’s agency can do the same. The lecture will analyze existing cases and provide a framework for dynamic environmental storytelling in games.