Two children teams are involved. The first one put five stones one on another building up "a castle". The second team throws the ball at the castle. If they put it down, they put the ball near it and run away. The first team tries to rebuild the castle. Meanwhile the children of the second team hit them with the ball. If the first team don't succeed in rebuilding it, they are the losers and the second team gains a point. And on the other hand the second team loses if the first team rebuilds the castle gaining one point. The game goes on. The winner is the team with the best result.