Recently bought theme park studio with the sale and so far I say it is really worth the money. One thing I have to ask though, is it possible to build coasters underground currently in theme park studio some how? If not then is that something they plan to add in a future update?

One other side note is that they need to improve the coaster editing for when you have completely finished the coaster. It is hard to explain, but if you have a flat 180 degree corner and want to make it acend using the nodes, then there will be a flat section in the middle of the corner making it unsmooth. Other than that, I find this game very enjoyable.
Edit:I have figured out how to fix this using the node editor and adjusting the heading, yet I still dont know a way to build underground. One other thing is they really should add an easier way to add a node to an already existing track piece.