The aim is to develop and evaluate an ExerCube training scenario for effective and attractive sports rehabilitation, especially for knee injuries. The focus is on phase 3 of the rehabilitation process. In this phase, it is important that patients re-learn to couple their gained physical functions to cognitive stimuli and to shift their focus using a motivating and fun environment. Based on focus groups together with rehabilitation experts, game designers are developing specific game scenarios triggering important process for this rehabilitation phase.