A novel interaction technology is shown in the exhibit of the lab of multimedia concepts and applications from Augsburg University. While the user moves in front of a 3D projection screen, he is wearing shutter-glasses enabling a 3D impression. Virtual characters autonomously move through the inner city of Augsburg. The user's task in this game is to catch a specific pedestrian, but to avoid hitting others in a crowd within a close time limit. Fast navigation through a crowd requires a very sensitive and accurate as well as unobtrusive and intuitive input system. A smart combination of an optical tracking system with the navigation control and the projection system provides a singular and amazing 3D experience. The navigation method introduced by this exhibit gives rise to new interfaces for 3D computer games. An additional technical innovation lies in the naturalness of character movements in the crowd simulation. Furthermore, the scene becomes alive through three-dimensional sound effects emitted in relation to the user's position together with an asymmetric viewing perspective. This is enabled by an optical tracking system developed and attended by the company inoptech, a spin-off of Augsburg University.