This app helps train german vocabulary in a playful way and is suitable for elementary school aged children. A whale presents one english word and the child can then choose the right german vocabulary which are each suggested by flying dragon fish. The blue monster Klaus then gives feedback. The underwater sound makes the playful environment seem more real and takes away from the school feeling. Points and collected fish are saved for every game and compared to previous highscores in order to measure progress. This game is distinguished by its loving design, a high learning and fun factor and its high didactic demand.