A human user uses his torso movements to steer a Festo Robotino robot along a pre-defined course. Our domestic service robot Caesar acts as a referee and autonomously follows the Robotino and makes sure that it stays within a corridor along the path. If the user manages to keep the Robotino within the corridor for the whole path he wins. The game can be used, for example, to engage people in physical training such as a rehabilitation after an injury. It was designed and implemented as a student project at the Knowledge-based Systems Group at RWTH Aachen University in winter term 2011/2012.