In Filler, your goal is simple: fill 2/3 of the level.
To create a filler ball, hold down your mouse button.
It will grow until you release the mouse button, it hits another filler ball, or a bouncing ball runs into it.
Hold down Mouse click to create a filler ball.
Release the mouse to freeze it.
You have a limited number of lives and balls each level.
If you squash a bouncing ball, it will reappear at the top right corner.
If a bouncing ball hits your filler ball, it will disappear and you will lose a life.
If all lives are lost or you run out of filler balls it's game over.