So let's have it then. I have to say that Ninja Gaiden 2 lvl 3-4 is the most insane i'v played. I could never get past the blowy mountain. And if a modern game? Shadows of damned EDIT: on insane! (lvl 3 and after)
So how about you? I know there are many more levels,missions. But these are just on top of my head.