6 countries:
The Beyond (Italy)
The Wailing (South Korea)
Requiem (Germany)
Alucarda (Mexico)
Jigoku (Japan)
A Dark Song (Ireland)

6 decades:
The Queen of Spades (1940s)
The Last House on the Left (1970s)
Prince of Darkness (1980s)
Stigmata (1990s)
Drag Me to Hell (2000s)
The Possession (2010s)

6 films from before 1966:
Dante's Inferno (1911)
The Phantom of the Opera (1925)
The Monster (1925)
The Black Cat (1934)
The Queen of Spades (1940)
Jigoku (1960)

6 films whose year ends in '6':
The Reptile (1966)
The Omen (1976)
Sometimes They Come Back...Again (1996)
Requiem (2006)
The Omen (2006)
The Wailing (2016)

6 films featuring work from the following: John Carl Buechler,
Jack Pierce, Rob Bottin, Screaming Mad George, Lon Chaney
and Carlo Rambaldi:
The Phantom of the Opera (Chaney)
The Monster (Chaney)
King Kong Lives (Rambaldi)
Troll (Buechler)
Humanoids from the Deep (Bottin)
The Black Cat (Pierce)

The 6th film of a franchise:
Paranormal Activity: The Ghost Dimension

1 Reptile Rampage film as tribute to Crawl:
The Reptile

2 women directed films:
Helter Skelter
Blood Sabbath

The lowest rated film from the 80s that you can access:
Jaws of Satan

1 film where the men and women of the church are having a bad day:
The Possession

1 Larry Cohen or Dick Miller film:
Tales from the Crypt: Demon Knight

1 Classic Universal:
The Phantom of the Opera

1 film with Dee Wallace in it:
The House of the Devil

1 film with a black director or predominantly black cast. (NO JORDAN PEELE):
Abby

1 film from a Mexican director to honor 2 great films from Gigi Saul Guerrero & Issa López. (NO GDT, but it can be GSG or Issa):
Alucarda

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film):
Lifeforce