One person is chosen to be it. They are then blindfolded and spun around, the other players all choose a noise to make (which they can't change once they start making), animal noises are best. Once everyone has chosen a noise, they start making it and move around the play area. The blindfolded player then chooses one of the noises being made and has to catch that person by following the noise, once they catch the person they swap places.
Source: From the original site.