Cinemonster's original list
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six (6) countries
1. Canada - The Changeling (1980); My Bloody Valentine (1981); and Scanners (1981)
2. France/Germany - Possession (1981)
3. Italy - The Beyond (1981); The House by the Cemetery (1981); and A Classic Horror Story (2021)
4. Japan - Godzilla (1954) and House (1977)
5. South Korea - A Tale of Two Sisters (2003)
6. Spain - The Orphanage (2007)
7. United Kingdom [extra credit] - The Curse of Frankenstein (1957); The Innocents (1961); The Haunting (1963); The Vampire Lovers (1970); The Wicker Man (1973); Lifeforce (1985); Kill List (2011); and Malevolent (2018)
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eight (8) decades
1. 1930s - King Kong (1933)
2. 1950s - Godzilla (1954) and The Curse of Frankenstein (1957)
3. 1960s - The Innocents (1961) and The Haunting (1963)
4. 1970s - The Vampire Lovers (1970); The Wicker Man (1973); and House (1977)
5. 1980s - The Changeling (1980); The Beyond (1981); The House by the Cemetery (1981); My Bloody Valentine (1981); Possession (1981); Scanners (1981); and Lifeforce (1985)
6. 1990s - Jacob's Ladder (1990); Tremors (1990); Child's Play 3 (1991) and The People Under the Stairs (1991)
7. 2000s - A Tale of Two Sisters (2003); Scary Movie 2 (2001); American Psycho II: All American Girl (2002); Blade II (2002); and The Orphanage (2007)
8. 2010s - Kill List (2011) and Malevolent (2018)
9. 2020s [extra credit] - A Classic Horror Story (2021)
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two (2) folk horror films
1. The Wicker Man (1973)
2. Kill List (2011)
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four (4) films that were released in 1981
1. My Bloody Valentine (1981)
2. Scanners (1981)
3. Possession (1981)
4. The Beyond (1981)
5. The House by the Cemetery (1981) [extra credit]
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two (2) films that were released during my birth year
1. Jacob's Ladder (1990)
2. Tremors (1990)
3. Child's Play 3 (1991) [my princess's birth year]
4. The People Under the Stairs (1991) [my princess's birth year]
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two (2) haunted house films
1. The Changeling (1980)
2. The House by the Cemetery (1981)
3. House (1977) [extra credit]
4. A Tale of Two Sisters (2003) [extra credit]
5. Scary Movie 2 (2001) [extra credit]
6. The Orphanage (2007) [extra credit]
7. The Innocents (1961) [extra credit]
8. The Haunting (1963) [extra credit]
9. Malevolent (2018) [extra credit]
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one (1) film meeting all of the following criteria:
(a) that is the second installment/"Part Two" of its franchise/series;
(b) that we haven't seen before;
(c) that we can access; and
(d) that is the lowest rated such film, according to Letterboxd’s users, which meets criteria a, b, and c
1. American Psycho II: All American Girl (2002)
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one (1) film that is set in the woods
1. A Classic Horror Story (2021)
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one (1) Kaiju or Kong film
1. Kaiju - Godzilla (1954)
2. Kong [extra credit] - King Kong (1933)
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two (2) Hammer Film Productions films
1. The Curse of Frankenstein (1957)
2. The Vampire Lovers (1970)
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three (3) films by a non-Asian person of color director or featuring a non-Asian person of color lead
1. The People Under the Stairs (1991) [person of color lead]
2. Scary Movie 2 (2001) [person of color director]
3. Blade II (2002) [person of color lead]
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three (3) films by an Asian director or featuring an Asian person of color lead
1. Godzilla (1954) [Japanese director and Japanese lead]
2. House (1977) [Japanese director and Japanese lead]
3. A Tale of Two Sisters (2003) [South Korean director and South Korean lead]
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and one (1) Tobe Hooper film
1. Lifeforce (1985)
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and since we ended up with "only" 27 movies after satisfying all of the above criteria, we added the following films (all of which also meet or otherwise relate to at least one of the criteria above) to reach the magic number of 31 (actually 51, in our case, but who's counting?!) films:
1. The Witch (2015) [folk horror and the woods]
2. Apostle (2018) [folk horror]
3. Midsommar (2019) [folk horror]
4. An American Werewolf in London (1981) [1981]
5. The Burning (1981) [1981 and the woods]
6. The Evil Dead (1981) [1981; haunted house; and the woods]
7. Just Before Dawn (1981) [1981 and the woods]
8. Ms .45 (1981) [1981]
9. The Silence of the Lambs (1991) [my princess's birth year]
10. House on Haunted Hill (1959) [haunted house]
11. The Amityville Horror (1979) [haunted house]
12. The Shining (1980) [haunted house]
13. The Others (2001) [haunted house]
15. Paranormal Activity (2007) [haunted house]
16. Insidious (2010) [haunted house]
17. The Conjuring (2013) [haunted house]
18. Crimson Peak (2015) [haunted house]
19. Sleepaway Camp (1983) [the woods]
20. Wrong Turn (2003) [the woods]
21. The Cabin in the Woods (2011) [the woods]
22. Wrong Turn (2021) [the woods]
23. Godzilla (2014) [Kaiju]
24. Kong: Skull Island (2017) [Kong]
25. Werewolves Within (2021) [person of color lead]
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extra credit per Cinemonster
1. J.D.'s Revenge (1976) [also 1970s and non-Asian person of color lead]
2. The Skull (1965) [also United Kingdom and 1960s]
3. The Scooby-Doo Project (1999) [also 1990s and the woods]