Haunted Mansion (HM) is a game played in The Whole Sort of General Mish Mash. In the game players move between a number of different rooms, using the objects within the rooms, their special abilities, and interacting with the other players to reach their individual and team goals.
According to Mastermind of Sin the idea and first games were created by Pooky on scumchat. The first forum game was organized by Occult and played in June 2007. The original game rules can be found here. Occult went on to start two other HM games, later games have been started by skitzer, Grek, Iron Man, Mokina, icemanE, and OhGodMyLife.
Other mansion style games, chronological order: