6 countries:
The Legacy (UK), The Cars That Ate Paris (Australia), Possession (France), Rodan (Japan), Alucarda (Mexico), The Frighteners (New Zealand)

6 decades
The Hunchback from Notre Dame (20s), I Bury the Living (50s), Homicidal (60s), The Mephisto Waltz (70s), Crimes of Passion (80s), The Dead Don't Die (2010s)

6 films from before 1966
Faust, The Leopard Man, The Ghost Ship, Homicidal, Strait-Jacket, X: The Man with X-Ray Eyes

6 films whose year ends in '6'
Alice Sweet Alice, Rodan, Eaten Alive, Gothic, Manhunter, TerrorVision

6 films featuring work from the following: John Carl Buechler,
Jack Pierce, Rob Bottin, Screaming Mad George, Lon Chaney
and Carlo Rambaldi:
Cat's Eye (Rambaldi), Humanoids from the Deep (Bottin), Society (George), I Bury the Living (Pierce), Bride of Re-Animator (George), The Thing (Bottin)

The 6th film of a franchise
Scars of Dracula

1 Reptile Rampage film as tribute to Crawl
Eaten Alive

2 women directed films
Humanoids from the Deep, Pet Sematary

The lowest rated film from the 80s that you can access:
Hobgoblins

1 film where the men and women of the church are having a bad day.
The Sentinel

1 Larry Cohen or Dick Miller film
X: The Man with X-Ray Eyes

1 Classic Universal:
The Wolf Man

1 film with Dee Wallace in it:
The Frighteners

1 film with a black director or predominantly black cast. (NO JORDAN PEELE)
JD's Revenge

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 Films (There must ALWAYS be a Hooper film)
Eaten Alive