Alright, here is my list for Hooptober. I only did films that I have not seen before, and I tried my best to have each film that I have chosen be necessary in order for all the criteria to be met. So, all of the films are essential. I will also start this on October 1st and try to finish on October 31st. Okay, so here is the criteria and the films I chose to meet them:

There must be 31 horror films

6 countries (other than Italy or US)
1. Canada: The Brood
2. Japan: House
3. UK: Peeping Tom
4. France: Possession
5. Russia: Viy
6. Mexico: Even the Wind is Afraid

9 decades
1. 1930s
2. 1940s
3. 1960s
4. 1970s
5. 1980s
6. 1990s
7. 2000s
8. 2010s
9. 2020s

5 Zombie Films
1. White Zombie
2. Shock Waves
3. Dawn of the Dead
4. Zombie Flesh Eaters
5. The Return of the Living Dead

3 cult or conspiracy horror films
1. They Live
2. The Seventh Victim
3. Race With the Devil

1 film from a Black director with a Black lead
1. Blacula

1 film from a Mexican or Central American director
1. Even the Wind is Afraid

1 Canadian film
1. The Brood

1 Russian or former Russian state film
1. Viy

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

2 Post Apocalyptic horror films
1. Dawn of the Dead
2. The Terror Within

1 Film with dreams or a dream as part of the plot
1. Dreamscape

1 The animals are pissed at us film
1. The Birds

1 Silent film
1. Begotten

4 based on Novels
1. The Wizard of Oz
2. Christine
3. The Howling
4. The Sentinel (could also probably count for cult but idk)

Any film from THIS list that you haven't seen.

1 Ernesto Gastaldi written film
1. Torso

1 film from 1932
1. Freaks

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

And 1 Tobe Hooper Film (There must ALWAYS be a Hooper film)
1. Eaten Alive

If anyone sees this list and there are any mistakes or any of the films are not essential to the list please let me know.