Arrange all the players except one in a circle close together and facing in. The extra player, 'It' is outside the circle. 'It' runs around the circle and tags some player on the back. 'It' immediately turns around and runs in the opposite direction around the circle. The player touched runs around the circle in the direction opposite to that taken by 'It'. The player who first reaches the gap steps into it and wins. The other player becomes 'It' for the next play.
None
Any number of players
Make sure to explain rules clearly before starting. Divide players into equal teams for fair competition.