To play this game you need to form two equal circles, one inside the other. Set the circles up so one person from each circle is physically standing back to back to one member from the other circle. (I use a spot on the ground to mark the spot for each circle)
These circles both start moving in clockwise motion, ensuring each member of the circle passes through the “spot”. Someone who is not in either one of the circles and not facing them, will call stop. At that point the people on each spot must turn around and face each other. The person who names the other first wins that round and the “loser” joins the other circle.