I usually agree with you, CodeMan, but not this time.
There doesn't need to be a plot, but a regular tableau house where we have samples of a level or two with various killers popping out in different areas. Trapper in a room full of bear traps and a person acting like they're stuck before being grabbed, turning a corner in a dilapidated house to come face to face with a mirror trick Wraith, go into a farmhouse or slaughter house room and have the Hillbilly revving the chainsaw, turn and go into a doctor's ward to see the Nurse chasing a survivor and the Doctor shocking up an electric chair...
I could literally go on and on and on and on and on and it takes no stress on the imagination to assume it would literally be like the easiest house for them to make because it's no different than any other haunted house attraction anywhere else in the states that lacks a plot or specific direction. Just freaky actors being them freaky selves in freaky locations.