There must be 31 horror films

6 countries (other than Italy or US)
UK: Shaun of the Dead (2004)
Australia: Cargo (2017)
France: Martyrs (2008)
Canada: Scanners (1981)
Mexico: Cronos (1992)
South Korea: Train to Busan (2016)

9 decades
1920s, 1940s-2010s

5 zombie films
Shaun of the Dead (2004)
I Am Legend (2007)
The Crazies (1973)
Braindead (1991)
Train to Busan (2016)

3 cult or conspiracy horror films
The Lodge (2020)
The Sacrament (2013)
The Endless (2017)

1 film from a black director with a black lead
Bones (2001)

1 film from a Mexican or Central American director
Cronos (1992)

1 Canadian film
Scanners (1981)

1 former Soviet state film
Viy (1967)

The most popular film from the 1940s that I haven't seen and can access
Cat People (1942)

2 post apocalyptic horror films
Cargo (2017)
Day the World Ended (1955)

1 film with dreams or a dream as part of the plot
An American Werewolf in London (1981)

1 the animals are pissed at us film
Frogs (1972)

1 silent film
The Cabinet of Dr. Caligari (1920)

4 films based on novels
Cujo (1983)
The Birds (1963)
The Howling (1981)
Christine (1983)

Any film from THIS list that I haven't seen
House on Haunted Hill (1959)

1 Ernesto Gastaldi written film
All the Colours of the Dark (1972)

1 film from 1932
Vampyr (1932)

The Wizard of Oz (1939)
Oz the Great and Powerful (2013)

1 Tobe Hooper film (There must ALWAYS be a Hooper film)
Lifeforce (1985)

3 bonus films
Night of the Eagle (1962)
The German Chainsaw Massacre (1990)
Trick or Treat (1986)