User blog comment:Cloud MCLight/What is the hardest map you've driven on?/@comment-4133167-20150326032321

I would say Dubai or Monaco. There are a lot of unexpected bends and bridges in Dubai. In Monaco the traffic is dense (and slow moving, making it a nuisance when drifting to avoid the sharp curves) and by the seaside the sunlight will be blind you causing you to crash into some bus). All maps aren't too hard when you master all of them tho.