place the dots at the top of the screen. Put a rule in the dots that interpolates self.positionY to 0 (whatever number is right for you, 0 is the bottom of the screen on the Y axis), select the time you want it to get there in and whether to ease in etc. Also, have another rule that interpolates self.alpha (colour) to 0 in the same time you used in the above rule. If you no longer need the actors once they hit the bottom you could have a rule that when self.positionY = 0, destroy.
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Hope that helps and gets you started