Filling water balloons has always been a chore, but it has been a chore that was well worth it, because you get to splash an unsuspecting victim. In Filler 2, there is no unsuspecting victim, but you get a chance to fill 2/3 of the screen with balls. Use your mouse to left click and hold to create a ball. But, if it were that easy it wouldn't be a game so they've added bouncy balls that will make your life difficult. If the bouncy ball hits your ball while it's filling, it's game over. But, once the balls are filled, the bouncy balls can't stand a chance.