Of course, theres meen numerious disucssions into what themes are in each game. All however, have the basis of personal, personaified purgatory, in which your horrors and regets take shape because of your lack of innocense (Example: That little girl in one of the SH games that isn't Harry's daughter, she hasn't been tainted yet, which in this case, her innocense - because she is still only a child and thus appears normal and un-aware of Silent Hill's montrousities and dense fog).