The random flashes in the sky? That's lightning (but unfortunately silent... Please don't go on the roofs of the buildings outside, it'll put more than 1000 polys onscreen and overload the engine (the screen will go weird... if this happens, just look at the floor ingame)... there are a lot of scenes with high poly counts. All 3 difficulties work with diff objectives and diff numbers of guards. I have a lot of scenes with about 800 polys... so it'll be slow... sorry ppl =) And don't complain about it being too hard. No matter what diff, you still have the same amount of weapons, etc... so no complaining. IT IS MEANT TO BE HARD!!!
This is my first attempt at a level... so please be gentle =)