The goal of Filler is to fill up two thirds of the screen while you avoid the bouncing balls. Sounds easy, right? Wrong, it's anything but! Press down on the mouse button to create a filler ball it will continue to grow until you release the mouse button, or run into a filler ball, or a bouncy ball. For each round, you'll have a limited number of lives and balls available to you - should you run out of balls, each new ball will cost you one of your lives, and should you end up running out of lives, it's game over for you. At the end of each level you will earn bonus points for things such as filling up more than 2/3rds of the level, the number of lives you had remaining, the amount of time remaining, and the amount of balls remaining. Don't worry too much about the timer - it's only used for bonuses, so it's not a big deal if it runs down to zero - you'll just earn a few less points is all.