More Diversification? Experience it in different Places & Challenges in this FPS similar Game, where you can try to free the World from Ghost's.
This is for example the Forest-Level.
when you will see more Levels, you can look here:
Indiedb.com (Please scroll down there)
or at the GW3D Homepage: Ghostworld3d.beepworld.de
or here: Mobygames.com
or try the google image search,
or look the gametrailer (for GW3D v0.91 and higher).