Yea, I wonder also. I've read in the user's manual to consider LOD (level of detail) So what I gathered was you have 4 levels of detail and the most detailed level is where your'e currently and then you have the levels switch according to where the player or camera moves to. Also I think you only skin the visible sides of the blocks in your level and turn off shading for anything that's not visible , like the back sides of blocks etc. Also I haven't tried it yet but you can do things like level change in the middle of the game, for example, if a guy walks into a building with a lot of stuff in it, you can treat that like it's own level etc. Oh well, I'm still strugling with how to get my terrain to show up textured in the edit mode so that I can place buildings etc. So I've got a ways to go. Also I say read the manual on the LOD I mentioned because I could be wrong , I'm just intermediate. Hope that helps any. -Brut