The leader selects on pair to be split into a cat and a mouse. The cat wants to be with the mouse, but the mouse does not want to be with the cat. This will lead to a room full of slowly moving pairs and a cat chasing a mouse around the room. Eventually the mouse will be caught and the cat and mouse join back in as a pair. The mouse still does not want to be with the cat. The mouse may reach out and join any pair that is milling around the circle.
While the players are milling around the room the players will secretly decide if they are an egg or a sperm. Even though the players don’t advertise this it will become obvious as eggs will move at a normal walking pace and sperm can walk briskly. The player then must choose to one other player in the room to be a barrier. The player then must choose another player to be a gamete other than their own. An egg would choose a barrier and a sperm. A sperm would choose a barrier and an egg. In the initial version of this game the egg will move to keep the barrier between themselves and the sperm. The sperm would move towards the egg and avoid the barrier. However, life is more complicated than this.
ach player secretly picks a bully and a bodyguard from amongst the other players. The bully and the bodyguard must be two different players. The leader checks to make sure that every player has selected a bully and a bodyguard. The players will try to avoid the bully by moving so that the bodyguard is between the bully and themselves. Do not run.