I thought up a haunted house idea. I will give you the basic synopsis and we could work out the rooms and other details
Mystic Mountain Funhouse has been deserted for years. This former roadside attraction was once a hangout for teens and thrill-seekers everywhere who appreciated the thrills the funhouse brought with illusions and non-lethal traps. Unfortunately, Mystic Mountain was forced to close it's doors after a trap caused the death of a patron. For the next 20 years, the funhouse sat abandoned and destitute. Recently however, people around the area have reported hearing strange noises and seeing shadowy figures entering and leaving the funhouse at night. It turned out that squatters where living in the abandoned structure which was now rotting with age. Two policemen were sent into the fun house along with the structures current owner to force these squatters out, none of these men came out. Now it is up to you to venture into the rotting fun house to find the missing men and to evict the squatters.
My idea is that the squatters are actually cultists that worship a mysterious entity called " The Red Lady" and are using the funhouse as a home and place of worship. What do you think this house would look like? What should the Red Lady be?