Mission 4 was quite fun to speedrun, not many areas that frustrate. Plus the level design itself is interesting. There's a section in the middle which I've been able to pass through with a much quicker time, but it seems to mess with the rest of the run, so I'm settling for this for now. But I'm sure a sub 4:00 time is possible.

Rules of this run: -Hardcore difficulty. -Don't raise an alarm. -Don't kill civilians. -No saving/loading.