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.