I tried before to partake in this challenge and failed, so I'm gonna try to redeem myself by joining in this year.

Cinemonster's original list
Rules:

There must be 31 horror films
6 countries (other than Italy or US)
Japan, Sweden, Canada, South Korea, Russia, Mexico
9 decades
20s, 30s, 40s, 50s, 60s, 70s, 80s, 90s, 00s, 2010s, 2020s
5 Zombie Films
28 Weeks Later, Versus, Ozombie, Cargo, The Night Eats The World
3 cult or conspiracy horror films
Apostle, Jacob's Ladder, The Invitation
1 film from a Black director with a Black lead
Eve's Bayou
1 film from a Mexican or Central American director
Huesera: The Bone Woman
1 Canadian film
Dead Ringers
1 former Soviet state film (Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan)
Night Watch
The most popular film from the 1940s that you haven't seen and can access..
Cat People
2 Post Apocalyptic horror films
Cargo, Stake Land
1 Film with dreams or a dream as part of the plot
Jacob's Ladder
1 The animals are pissed at us film
Piranha
1 Silent film
A Page of Madness
4 based on Novels
The Shining, Invasion of the Body Snatchers (both versions), The Old Dark House
Any film from THIS list that you haven't seen.
Killer Klowns from Outer Space
1 Ernesto Gastaldi written film
Your Vice is a Locked Room and Only I Have the Key
1 film from 1932
The Old Dark House
and The Wizard of Oz (1939)