I used to play an arcade game where you have a line that you move in a large square (or rectangle, I an not sure which) and the goal is to box off, with your line, over 75% if the square. The computer has a 'defender' type of enemy that tries to stop you from taking any area. What you 'box off' turns a different color and you get points based on how fast and how large of areas you box off. After the first level or so, the computer adds a second 'enemy' that tries to stop you. If you get touched by the 'enemy' you die. I remember it being in arcades in the early/mid 80's. Anyone know the name of this game???