Thrillville Otherworlds can be unlocked along with Thrillville Giant and Thrillville Explorer once you reach the third management level in Thrillville: Off the Rails.
The park is based around unusual or imaginary worlds such as a futuristic city, a world entirely inside one of Thrillville's own games, or an underwater paradise.
The three parks include Usagiville, which is a world based entirely on the Sparkle Island and Sparkle Quest arcade games, Astroville, a world based on space and the future, and Oceanville, an underwater-themed world.
USAGIVILLE- based on sparkle quest
OCEANVILLE- based on the undersea
ASTROVILLE- based on outer space
This park has been overrun with robots, most likely due to Vernon Garrison's evil schemes. Most of the missions revolve around getting rid of all of the robots and filling the park back with happy guests.
once you reach level 4 you could unlock either giant or explorer is you've unlocked this park at level 2