Panic Park is a strange park that was made in the 1950s.
Panic Park seems to have all the answers to what is going on in HorrorLand.
It was founded by a private man named Karloff Mennis. A mirror is required to get into Panic Park and that is why mirrors are not allowed in HorrorLand, because it prevents guests from escaping to there.
In "The Streets of Panic Park," Slappy the Dummy, Captain Long Ben One-Leg, Dr. Crawler, Inspector Cranium and the other Goosebumps villains later help the characters escape from Panic Park and defeat Karloff Mennis.