Research on interactive wall displays has thus far focused mostly on professional use. However, as large displays with support for touch and other input modalities become more common, it becomes reasonable to assume use in more casual settings as well. We present Miners, one of the first collaborative games for a touch-sensitive display wall, and investigate multimodal, multi-user interaction in this context. In this fast-paced game, four players cooperate to rescue workers trapped in an underground cave, with each player being able to influence the game world in a different way. In an exploratory study using Miners, we found that players enjoyed the game and showed very high engagement. On the other hand, awareness suffered: Players often missed events in other areas. In addition, we found limited awareness of other players' actions and social cues. We report on these results in detail and discuss implications for touch-based wall interaction in general as well as in other application contexts.