There are two teams, the low pucks and the high pucks. The goal is to claim as many balls as possible.

When both pucks from one team are placed, a line extends between them. If it closes the gap and reaches the walls without hitting a ball, it becomes permanent. If one side of the two new areas now contains only one color of ball, that side becomes solid and the balls within it are claimed by the team creating the wall.

Each team can have only one line in progress at a time.

SIMULATOR NOTE: Gameplay is impacted slightly by the simulator, since it is not possible to pick up both of your teams' pucks at a time. I recommend positioning one puck while the previous line is being drawn, then placing the second when you are cleared to go again.

Source code available, based on a flash game I can't find any more.