two circles of people people are matched up with each other by sharing the same number eg 1 - 5 on inner circle 1 -5 on outer circle the circle have to run round - one anti clockwise one clockwise when madrich says halt they all have to stop and look at the floor then a number is called out and the pair with that number have to swop places still with their eyes on the floor (to know where they need to be they ahve to be looking before the person says stop)