collect balls of the same color, 4 or more in a row.

click on any ball to transform it into the center of gravity
and all the other balls will move in its direction ...

there are three special kind of balls:

1. bomb: click it, and all the balls wihin a certain radius
will disappear with it.

2. converter: click it, and all the balls of the same color
will disappear with it.

3. shaker: click it to shake everything
and change the ball's positions.