CorsixTH aims to reimplement the game engine of Theme Hospital, and be
able to load the original game data files. This means that you will need
a purchased copy of Theme Hospital, or a copy of the demo, in order to
use CorsixTH. After most of the original engine has been reimplemented in
open source code, the project will serve as a base from which extensions
and improvements to the original game can be made.