The squeeze bars randomly grow in from both sides of the room. You must shoot them back and attempt to get out of the room. The bars will begin moving faster and faster as time goes on. If you succeed in leaving the first room, you enter the next room with faster growing bars.
Left difficulty switch must be set to B position (Slow Bar speed).
Right difficulty switch can be set to player' s discretion (A = manual fire, B = automatic fire).