In Filler, your goal is simple: fill 2/3 of the level.  To create a filler ball, press down.  It will grow until you release the mouse button, it hits another filler ball, or a bouncing ball runs into it.**********Update (1/18): Dragging balls outside the level should now be fixed.  By popular request, the balls respawning are a little more intelligent&#8212;if you&#8217;re making a ball on the right side of the screen, they&#8217;ll respawn top left (and vice versa).  Yay feedback!