Betrayal at House on the Hill
Betrayal at House on the Hill is a 2004 American horror-themed board game with exploration and cooperative elements, allowing up to six players.  It was designed by Bruce Glassco with assistance from Rob Daviu, Bill McQuillan, Mike Selinker, and Teeuwynn Woodruff.  The haunted house is constructed as the players explore it, with several scenarios, traps, and omens revealed as play progresses. After enough omen points are accumulated, the haunt begins, and a new objectives pits players against each other in some form.