There's been a lot of requests for "How to do zas runs?!". You may say that it's for the cheap runs resource wise, but haha. No. This, like heavy construction, is a path to poverty. The run may be cheap, but it'll get you in other ways. Namely, disposing all of the garbage equipment you'll get during your runs.
Due to popular demand, here's a leveling guide. Starting with the normal leveling process, then onto other special methods of leveling.