It’s actually really good, I played it quite a bit earlier this year. The main thing that makes it a lot better from the original rct2 is speed up button. It’s also entertaining to peek at the C code and figure out how they are calculating certain things like excitement rating.
"OpenRCT2 needs the object files (containing graphics, sounds and models) from the original RollerCoaster Tycoon 2 to work. You'll need to have a copy of RCT2 before beginning."
After a number of years, the OS version of Transport Tycoon allowed developers to use their own graphics package; they made and open sourced one of those, so needing a copy of the original game was no longer necessary.
