I clarified the rules in this thread http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=613208 But I would have to say you could only use Truespace for props. The Bryce metaballs have to be used if you have 5, but I really am not going to know. you would just be missing out on an interesting new feature that was kind of fun to work with. Does that help?