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In Filler, the objective is to fill 2/3 of the screen with filler balls. To create a filler ball, press down on the mouse. The ball will grow until you release the mouse button, it hits another filler ball, or a bouncing ball runs into it. Another way to describe the objective of Filler is to say that you must fill the screen with filler balls so that no more than 1/3 of the screen is empty.
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