Parking is already tough as it is since you would need to make sure that you are not going to hit anything or someone as you park your vehicle. Some people have no problem with it since they have been doing that for a long time. But, those, who are just starting feels the pressure and they would tell you that it isn't easy at all. Now, if you are going to park your car at the roof then the pressure would double since it is more dangerous than just parking on the ground. Somehow, you have no choice, but to park your car there since you need to pick up a package that would come from the plane. They would just drop it in the sky and you need to pick it up as fast as you can. It sounds easy, but the pressure is there since it is very dangerous.
In this game, you need to park your car and collect the package that the airplane drops. There is a time limit, so you need to do it in a hurry. The game immediately if you are not quick to react. The game would be more difficult as you make some progress.