Ghost Master

The bonus level is included in the Steam and Good Old Games release of the game. The bonus level "Class of Spook'em high" is the only downloadable content released for the game. In the level, the Ghostbreakers attack the HQ of ghost master, an old, abandoned mansion where the player has to defeat the Ghostbreakers in order to win the game. The bonus content was released in place of a sequel.

Each level also has "Restless Spirits," haunters bound to a certain location in some levels, there are often "secret" locations of the haunters, requiring the player to use a move or complete an objective to reveal their location, usually having a back-story as to why they are there. The player can use haunters they already brought with them to free them using a certain move, or a combination, an example is in the first level, the restless spirit, "Weatherwitch" is bound to a vacuum cleaner the player has to use an electric fetter move to free her, causing the vacuum cleaner to malfunction, and release weather-witch.

All mortals have a belief level, which partially determines the effectiveness of a ghost's powers upon them. The belief bar is raised slightly with every scare, and particular powers are able to raise belief better than others. Every mortal also has conscious and subconscious fears which are linked to certain ghost's powers. Scaring a mortal with a power that targets their individual fear is particularly effective. These are usually unknown at the beginning of each level, but some ghosts have the ability to expose these fears.

Mortals also have a terror level and a madness level, with certain limits to each. When a human's terror bar is raised to a certain level, they flee; this is the objective of most of the in-game levels. The madness bar is filled only by the use of certain powers. When a mortal's madness bar reaches a certain point, they go insane, which is visible in that they now just roam the area of the scenario in a frenzy and are unable to be scared or maddened any more. The fear bar reduces as time progresses in the game, but the belief and madness bars do not.

Somewhere between average humans and ghosts are priests, witches, and mediums. These humans have the ability to banish ghosts that are fielded. Banished ghosts are no longer usable during that level, but are returned after the mission is complete. Also, a large score penalty is levied on players who allow ghosts to be banished.

Ghostbreakers are the most dangerous mortals, from a supernatural perspective. They are able to detect and banish ghosts at a much faster speed than the other "special" mortals mentioned previously. They are also able to field special wards, which prevent the player from fielding, or benching, ghosts trapped underneath them. Only if the electrical generators are destroyed do the wards fail.