told her about their past cases before inviting the group to come inside, but Scooby and Shaggy refuse. Fred, Daphne, and Velma follow Holly inside, leaving Shaggy and Scooby outside alone. When Shaggy goes to obtain a box of Scooby Snacks he notices hanging from a gnarled tree, he pulls on one of the branches and falls into a trap door. Frightened, Scooby explores the grounds and discovers a nearby playground where he collects a monster token, receives some clues for the mystery, and eats all of the Scooby snacks. He then enters the mansion and discovers Holly locked in a room. She explains that a specter called The Mastermind appeared, kidnapping Fred, Daphne, and Velma before imprisoning her, and gives him a map of the region for getting around. Unable to navigate the rest of the mansion, Scooby returns to the front yard where he speaks with Graham's gardener (Don Knotts), who gives him a shovel. The shovel allows him to obtain a key to the nearby fishing village. Between the Fishing Village and the docks to the ocean, Scooby encounters Shaggy once again, who assists him with unlocking an entrance to the piers of the village before, again, vanishing without a trace. Soon Scooby comes to an old lighthouse, where he acquires one of Graham's inventions: a pair of springs, which allow him to double jump. Scooby uses this ability to obtain a key to the mansion's topiary garden. Scooby makes his way back to the mansion grounds. He navigates the topiary garden, where he obtains one of the professor's inventions: a helmet, allowing him to destroy attacking monsters and bash through cobwebs. Scooby explores the mansion, making his way through numerous rooms, the library, and the attic, before arriving at the top of a tower. He meets The Mastermind, who reveals that he is responsible for resurrecting the monsters and ghosts the group has unmasked, before revealing Velma trapped in a cage, which is guarded by the Black Knight, the first monster Scooby ever encountered. Scooby is able to destroy him by pressing switches which electrocute him, before freeing Velma from her cage. She flees in terror, claiming to see the Creeper. Scooby does not follow her as he does not see the Creeper anywhere in sight. Following this, Scooby explores a local cannery, along with the overhangs and some interconnected tunnels under the mansion, which lead