Here is a basic BGE level that is just the mesh and textures. It dose not have doors or enemies because I wanted you to be able to import it in to you game without any nasty logic bricks or messy scripts. In theory this was a nuclear explosives plant in the middle of Afghanistan that had a melt down; leaking toxic waste everywhere (hence the green lake). Now enemy forces have taken over the area and are rebuilding it. Your job is to place explosives on the main generators and RUN! That should blow the plant to smithereens and take out the rest of the bad guys that you missed on the way in ;) Like I said it is just the mesh and textures, but at lest you will not have to worry about the majority of the level design and creation.
This is possibly a level in a FPS game that BlenderGE and I are working on so keep a eye out for updates on that!
Please post if you like it and tell me about the upgrades you want to see on this blend. And may the .blend be with you always…