Films are moved to the top once I watched them. 

All of the films are first time watches except The Wizard of Oz.
Some of the films are in multiple categories.

QUICK EASY RULES:

There must be 31 horror films

6 countries (other than Italy or US)
Tokyo Zombie (Japan)
Vampyr (Germany)
Cronos (Mexico)
Häxan (Sweden)
The Hourglass Sanatorium (Poland)
Death Haunts Monica (Spain)

9 decades
Häxan (1920s)
Vampyr (1930s)
Zombies on Broadway (1940s)
The Hourglass Sanatorium (1970s)
Lifeforce (1980s)
Cronos (1990s)
Tokyo Zombie (2000s)
Us (2010s)
Crimes of the Future (2020s)

5 Zombie Films
Tokyo Zombie
Zombies on Broadway
Lifeforce
Dawn of the Dead
Cemetery Man

3 cult or conspiracy horror films
I Drink Your Blood
The Wicker Man
Society

1 film from a Black director with a Black lead
Us

1 film from a Mexican or Central American director
Cronos

1 Canadian film
Crimes of the Future

1 former Soviet state film (Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan)
The Touch (was Chainsaws Were Singing)

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
Night of the Comet

1 Film with dreams or a dream as part of the plot
A Nightmare on Elm Street Part 2: Freddy's Revenge

1 The animals are pissed at us film
Jaws 2

1 Silent film
Häxan

4 based on Novels
Tokyo Zombie
Vampyr
The Hourglass Sanatorium
Lifeforce

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

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)
Lifeforce

The rest of the 31 are just horror movies I want to check off of my watchlist
The Old Dark House
Planet of the Vampires
Conquest
Digital Devil Story - Megami Tensei
Tetsuo II: Body Hammer
The Quiet Family
Bones
Sweeney Todd: The Demon Barber of Fleet Street

-review them all.(eek)

Clearly one film can satisfy multiple criteria. Viewing and reviewing will begin at 12:01am CST on Sept 15th.

Update: I originally had the film the Chainsaws were Singing on my list. I didn't realize the film was still in the middle of its festival run, and there would be no way for me to view it. So instead I replaced it with The Touch. (10/27/25)

Update: I completed the challenge with just minutes to spare. I don't know if I'll be back next year. I think the problem was I didn't really watch too many of the films until October, and then I got to a point where I had to watch a film every night or I'd fall behind. And I did, this last day I watched the final three films. Also, I ended up leaving some of the films I wasn't as excited to watch towards the end so it really became a slog. Another thing is that while all of these films were labeled horror by Letterboxd (besides The Wizard of Oz), only two were really scary, being A Nightmare on Elm Street Part 2: Freddy's Revenge and Us, which not all horror films need to be, and thank god for that, because I am still trying to be okay with being scared, but maybe there should have been a few more. That's my fault though, I choose the films (besides The Wizard of Oz). I found some new favorites though.

Some of my new favorite films which I recommend:
Crimes of the Future
Society
The Old Dark House
The Wicker Man
Tetsuo II: Body Hammer
Vampyr
The Last Man on Earth
Dawn of the Dead
Häxan