The pupils, upon the command of the player who is the leader and stands in front of the class, fold their arms upon the desk and lower the head upon the arms. The leader has an eraser or other article which he places upon one of the desks. He commands 'Heads up' and the pupils raise their heads. The one finding the eraser on his seat rises and chases the leader. If he catches him he becomes the leader; if not, the first one is again the leader. If they fail to catch him after two trials he chooses another leader.