The family mansion is going to be demolished and replaced by an amusement park, and therefore the family will be evicted. While the adults are trying to find a solution, the children roam the house helping out in their own peculiar way. Only if they find the estate ownership documents will the contractors can be stopped.
Plot[]
Game play consists of interacting with a cast of ghoulish residents who populate the house and move about it, and in collecting and exchanging an inventory of items with them. All of the main characters, as well as the house itself, contain artificial personalities that react to the actions of the player; the moody characters and the opportunity to explore the house in any order creates near-infinite replayability. Dozens of activities and puzzles embedded in the game also have consequences. These activities include a monster assembly lab, monster movies in the screening room, cooking a concoction in the kitchen, composing an organ tune, and other traditional puzzle games adapted to the computer. The game contains many clever voices and the opening tune "Monster Mash".
A cast of characters populate the house and make appearances throughout in the game. These include Frankenstein, a vampiress, a two-headed monster, a mad scientist, and a normal human child (transported there by the mad scientist's lab ray). Gahan Wilson is a ghost in the game, but there are two Gahans: one good, one evil, and deciphering which is which is one of the elements of game play. The thirteen rooms include a menagerie, kitchen, foyer, torture chamber, the monster lab, the screening room, the game room, a library, an attic, a bathroom, a basement hallway, a music room, and an art gallery. There are also a variety of monsters whose interaction with the player is limited to placing curses upon them.