These are subparks -- parks in parks.
“Usagiville is a subpark of Thrillville Otherworlds. It is based on the world of the Sparkle...Usagiville
“Casaville is a part of Thrillville Giant. It's based on Mortimer's childhood and the entire park...Casaville
“Relicville is a subpark of Thrillville Explorer. It is modeled after the Dinosaur Age. Off The...Relicville