This app helps train the multiplication table in a playful way and is suitable for elementary school aged children. It doesnt matter if its division or multiplication - both are trained underwater. A whale presents the problems and the child can then choose one of the four answers which are each suggested by a jellyfish. 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.