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.