[Infernix]

You will find it among the vast vast Tree tops of the AliBama Jungle. But be careful there are animals afoot. From the treacherous saber toother mutated ninja turtle tiger to the woolly BarenySarous.....

But if you want the real answer you gotta draw a image. In the image there a are various colors that represent mountains grass trees and etc. Then there is some application that you use the turn that images into multiple amounts of levels.

Dont have graal installed right now but if you look somewhere in your graal folder...(If anything the gmap folder) youll find some pictures and stuff on it.
But Im sure someone will come around here and give you a full text book explaining how to do such a simple thing. I learned how by just looking at a few files.