"Thrillville is a simulation and strategy video game that simulates theme park management. It was developed by Frontier Developments, also a developer of the similar theme park game RollerCoaster Tycoon 3. The game is available on the PlayStation 2, the PlayStation Portable, and Xbox.
Thrillville: Off the Rails is a theme park simulation video game developed by Frontier Developments. The sequel to the 2006 game Thrillville, it is again published by LucasArts. It was released in North America on October 16, 2007"
Source: Wikipedia, "Thrillville", available under the CC-BY-SA License.