Hi, Edited last post = (Ok maybe I shouldn't be extending the Emitter, learning, learning.) Hmm, I think it's best to make one Emmiter do as much work as it can. Does that mean that .makeParticles() shouldn't be used for multiple events? Does anyone have best practise advice for multiple emitter events initiated by collision and set to x, y of collision objects? I will try looking at what Group can do.