Two teams (sometimes played leaders against students). The leaders try to catch the students and put them in prison. In the gym (or main meeting room) area the leaders can catch students by hitting them with something like a nerf ball. Outside the gym, however, the leaders need to actually tag them.
Here is where it gets tricky: leaders Can ONLY run in the gym. They are free to run as fast as they want anywhere they want in the gym, trying to protect a designated jail in the gym. Out side of the gym the leaders are very robot-like. They have to walk AND they can only turn if they touch a wall or come to the edge of a designated boundary/perimeter. Leaders have to strategize and maybe use three leaders to trap one student.
Prison: students go to prison if they are hit with a nerf ball or if they have been tagged. Students can get free only when another student touches the prison. Watch-out – once you are free the leaders can throw balls at you.
Always make the prison in the gym. Make sure the students know you cannot run outside the gym. Make sure the leaders know they cannot turn in any direction outside the gym area unless they touch a wall in front of them or come to the edge of a designated boundary/perimeter. Lights are on in the gym and off everywhere else.