Fun idea, but it is not possible to play Free Play without watching ads or paying. When you do watch an ad, you have to watch another one 5 seconds later just to keep building... you have to spend 75% of the time watching ads to just play. The airports fill up too quick and then you are penalized, making it impossible to generate income without watching ads. The UI is still not working reliably. Very disappointed. I really would love to try this game again once it works.