One player holds an imaginary magic ball in his hands and passes it to his neighbour with a “zwuusch” sound. The next player takes the ball and passes it on with a “zwuusch”. The magic ball must not fall onto the ground, so everyone has to pay attention, passing the ball quickly.
Other rules can be added:
If a player says “flip-boing”, they lift both arms towards the sky rather than accepting the ball, so the ball must change direction and go back the way it came from.
If a player says “zwuii” the ball can be thrown across the circle – but make sure to make eye contact with who you are throwing the ball to.