Haunted House is a mod for registered Wolfenstein, made by KFH Games. It was released on May 15, 2002.
Listed as being only a demo, the mod nevertheless conjured up a unique atmosphere in the horror vein, featuring zombies, bats, bleak and spooky sprites including tombstones, moving suits of armor and various other merchandise one would expect to find in an actual haunted house.
Coding features include colored floors, reloadable weapons and portable health items.
The mod was sadly never finished, and is only available in DOS.