I tried doing this last year and only watched 1 film, so this is my first real attempt!

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There must be (at least) 31 horror films

6 countries (other than Italy or US): South Korea, Japan, Mexico, Canada, Russia, UK, Germany

9 decades: 1910s, 1930s, 1940s, 1950s, 1960s, 1970s, 1980s, 1990s, 2000s, 2010s, 2020s

5 Zombie Films:
The Evil Dead ☑️
Evil Dead ☑️
Evil Dead Rise
Train to Busan
Zombieland ☑️
ParaNorman ☑️
The Girl with All the Gifts ☑️

3 cult or conspiracy horror films:
Invasion of the Body Snatchers
Martyrs ☑️
The Endless
Mandy ☑️
The Conspiracy ☑️

1 film from a Black director with a Black lead:
Candyman (2021)

1 film from a Mexican or Central American director:
Santa Sangre

1 Canadian film:
Possessor ☑️

1 Russian or former Russian state film:
Viy ☑️

The most popular film from the 1940s that you haven't seen and can access..:
Cat People

2 Post-Apocalyptic Horror Films:
The Last Man on Earth
10 Cloverfield Lane ☑️

1 Film with dreams or a dream as part of the plot:
A Nightmare on Elm Street ☑️

1 The animals are pissed at us film:
Jaws
The Host ☑️

1 Silent film:
Dante's Inferno

4 based on Novels:
The Night of the Hunter ☑️
Candyman ☑️
Perfect Blue ☑️
Battle Royale ☑️
Eyes Without a Face
Carrie
Bram Stoker's Dracula

Any film from THIS list that you haven't seen:
The Conjuring ☑️

1 Ernesto Gastaldi written film:
All the Colors of the Dark

1 film from 1932:
Vampyr ☑️

I have never made a specific film a part of this before, but WIZARD of OZ ('39):
The Wizard of Oz

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film):
Eggshells
The Texas Chainsaw Massacre ☑️

Bonus:
Trick or Treat
The German Chainsaw Massacre
Burn Witch Burn