Chillingo launch a new game name “collision effect” attach is the image of the game any one know how to create this effect. i think it’s collision by particles how to create this using cocos2D?

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By programming it yourself.
This isn’t supported by the particle system in cocos2d. You need a particle system where particles can attract or deflect each other, or even a particle system where you can apply physics or other movement logic to individual particles. Cocos2d doesn’t give you control over individual particles.
You could create this with sprite-batched sprites but this won’t be efficient or fast. Usually such systems are implemented at the lowest level, meaning custom OpenGL drawing, perhaps optimized with shaders.