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The object of this game is to fill in at least three quarters of the board. Any closed region with no balls inside will be automatically filled, so you accomplish your goal by cutting off empty areas of the board.
Wave the mouse over the board - you should see either a horizontal or vertical line. Click the right mouse button to switch it between horizontal and vertical. When you click the left mouse button, the selected line will be filled in.
The catch is that you're not allowed to hit any balls, and that the lines don't fill in instantly. If a ball hits your line before it's finished, your line will be cancelled, and you'll lose a life. Once a line is completely drawn, it's safe. Forever. Or until the next level, anyway.
When you fill three quarters of the board (there's a counter to tell you how you're doing), you'll get a nice bonus to your score, and you'll be moved on to the next level.