This is my first Hooptober! Here are the minimum requirements according to @cinemonster and my selections for each category:

There must be 31 horror films

6 Countries (other than Italy or US):
- Germany - The Cabinet of Dr. Caligari & Vampyr
- Russia - Viy 
- Canada - Scanners 
- United Kingdom - Lifeforce
- Mexico - Poison for the Fairies & Cronos
- South Korea - Train to Busan
- Japan - One Cut of the Dead
- France - Diabolique & The Night Eats the World

9 Decades:
- 1920s - The Cabinet of Dr. Caligari
- 1930s - Vampyr
- 1940s - Cat People & I Walked With a Zombie
- 1950s - Creature From the Black Lagoon, Them!, Diabolique, & Invasion of the Body Snatchers
- 1960s - The Innocents, The Haunting, & Viy
- 1970s - All the Colors of the Dark, Suspiria (1977), & Dawn of the Dead
- 1980s - Scanners, The Howling, The Dead Zone, Lifeforce, & Poison for the Fairies
- 1990s - Cronos
- 2000s - The Cell, Land of the Dead, Cthulhu, & The House of the Devil
- 2010s - Backcountry, Train to Busan, One Cut of the Dead, Suspiria (2018), The Night Eats the World, & Da Sweet Blood of Jesus
- 2020s - Mad God

5 Zombie Films:
- I Walked With a Zombie (1943)
- Dawn of the Dead (1978)
- Train to Busan (2016)
- One Cut of the Dead (2017)
- The Night Eats the World (2018)

3 Cult or Conspiracy Horror Films:
- Suspiria (1977)
- Cthulhu (2007)
- The House of the Devil (2009)

1 Film From a Black Director With a Black Lead:
- Da Sweet Blood of Jesus (2014)

1 Film From a Mexican or Central American Director:
- Poison for the Fairies (1986)

1 Canadian Film:
- Scanners (1981)

1 Russian or Former Russian State Film:
- Viy (1967)

The Most Popular Film From the 1940s That You Haven’t Seen:
- Cat People (1942)

2 Post Apocalyptic Horror Films:
- Mad God (2021)
- Land of the Dead (2005)

1 Film With Dreams or a Dream as Part of the Plot:
- The Cell (2000)

1 The Animals are Pissed at us Film:
- Backcountry (2014)

1 Silent Film:
- The Cabinet of Dr. Caligari (1920)

4 Horror Films Based on Novels:
- The Innocents (1961)
- The Haunting (1963)
- The Howling (1981)
- The Dead Zone (1983)

Any Film From THIS List That you Haven’t Seen:
- Cronos (1992)

1 Ernesto Gastaldi Written Film:
- All the Colors of the Dark (1972)

1 Film From 1932:
- Vampyr (1932)

Watch The Wizard of Oz (1939):
- The Wizard of Oz (1939)

1 Tobe Hooper Film:
- Lifeforce (1985)

Extra Credit:
- Burn Witch Burn (AKA Night of the Eagle) (1962)
- The German Chainsaw Massacre (AKA Blackest Heart) (1990)
- Trick or Treat (1986)

**All 31 horror movies (not including E.C. and The Wizard of Oz) were included in my decades section**