Pervasive and location-based games are played in the real world rather than on the screen of a computer or mobile device. This makes them difficult to study. Since players move around it is difficult to observe them, while at the same time many of the central game activities cannot be monitored simply through logs of device interaction. In our project, we develop tools that allow players to record their subjective experiences during an ongoing game. We report on the design considerations for such tools, and our first experiences of using them in a game session. Categories and Subject Descriptors H.5.2 User Interfaces: Evaluation/Methodology