Problem with Puzzle Bobble´s Stage. For a bonus stage. VIDEO INCLUDE

Rubiyooo

Hi guys i am making a video game and i want try to make a bonus stage.
http://www.puzzlebobble.es/juegos/PuzzleBobble.gif

I have a tank that shoot balls with number 1.
When a ball collide with another ball change a attribute called number to "2".

But when i shoot third ball i do not know how to do that all balls destroys if collide 3 or more balls together.

Any idea?



Thanks you very much!!

Rubiyooo

anybody? :S