Betrayal At House On The Hill
This a great boardgame for anyone who loves horror and all things spooky and creepy. Your party of 3-6 players start off exploring the house as a team, discovering the layout of the house as you go and triggering various events along the way. At a later point during the game the "haunt" is triggered and one player becomes the betrayer and must now work against the team in a scenario based on classic horror themes such as The Madman, Zombies or Werewolves.
There's many scenarios and the randomly generated nature of the game means you get a new adventure every time you play.