No of times NFS MW completed with challenge series

Yeah, it is too hard as we go near 40.
I am still in 34th one.

haha i finished it .ya the last challenges are really tough.Only one who know the roads and how to turn through curves can finish .After completing challenges,you can beat anyone .

its very easy when you go with a nice and capable car in the specified series.

Just practice hard bro, its not that difficult.
With practice you can easily complete any challenge series.And about the last challenge, i found it really easy to complete although the heat level is 7 there and the car to ride is Camero.....lol........
But its not impossible to complete it.Just game hard.........