Mine was probobly city 17 were you have to go take out the generators. At this one part I walked into a room and all these guns on the walls started shooting at me. Right then all the doors closed and i was trapped in there. I quickly turned on buddha mode to see if I could find a way back out but it didn't work and I had to start all over again. Another thing is that you can get lost so easily in that level! It is wierd!!