I hope you were serious...

Just an initial first pass...

Criteria:

• Stood the test of time (more recent ones are included that have potential)
• Rewatchable
• Not from big studios or big name directors (at the time they made them) - no Shining, Hellboy, Blade, eXistenZ, From Dusk Till Dawn, They Live, Mist, Event Horizon, etc. bit subjective but...

Also only 1 per franchise

• Dante's Inferno (1911)
• The Golem (1920)
• Nosferatu (1922)
• The Unknown (1927)
• Seven Footprints to Satan (1929)
• Freaks (1932)
• The Spider Woman (1943)
• Eyes Without a Face (1960)
• Peeping Tom (1960)
• Village of the Damned (1960)
• Matango (1963)
• Kwaidan (1964)
• Onibaba (1964)
• The Last Man on Earth (1964)
• Quatermass and the Pit (1967)
• Kuroneko (1968)
• The Illustrated Man (1969)
• Blind Woman's Curse (1970)
• The Texas Chainsaw Massacre (1972)
• Horror Express (1972)
• The Wicker Man (1973)
• Don't Look Now (1973)
• The Rocky Horror Picture Show (1975)
• Shivers (1975)
• Carrie (1976)
• Eraserhead (1977)
• House (1977)
• The Sentinel (1977)
• Suspiria (1977)
• Dawn of the Dead (1978)
• Halloween (1978)
• Alien (1979)
• Phantasm (1979)
• Zombie Flesheaters (1979)
• Friday the 13th (1980)
• Encounters of the Spooky Kind (1980)
• An American Werewolf in London (1981)
• Possession (1981)
• Scanners (1981)
• The Thing (1982)
• Xtro (1982)
• The Dead and the Deadly (1982)
• Human Lanterns (1982)
• Wacko (1982) - purely subjective
• Videodrome (1983)
• The Boxer's Omen (1983)
• Seeding of a Ghost (1983)
• Deadly Spawn (1983)
• The Company of Wolves (1984)
• Razorback (1984)
• Return of the Living Dead (1985)
• Mr Vampire (1985)
• Re-animator (1985)
• House (1985)
• From Beyond (1986)
• The Seventh Curse (1986)
• Henry: Portrait of a Serial Killer (1986)
• Evil Dead 2 (1987)
• Hellraiser (1987)
• Near Dark (1987)
• Bad Taste (1987)
• A Chinese Ghost Story (1987)
• Brain Damage (1988)
• Killer Klowns From Outer Space (1988)
• Tetsuo (1989)
• Society (1989)
• Tremors (1990)
• Magic Cop (1990)
• The Resurrected (1991)
• Braindead (1992)
• Cronos (1992)
• Dust Devil (1992)
• Body Melt (1993)
• The Crow (1994)
• Cemetery Man (1994)
• Killer Tongue (1996)
• Cube (1997)
• Ringu (1998)
• The Faculty (1998)
• Biozombie (1998)
• Audition (1999)
• Meatball Machine (1999)
• Wild Zero (1999)
• Versus (2000)
• Spiral (2000)
• Ginger Snaps (2000)
• The Devil's Backbone (2001)
• The Happiness of the Katakuris (2001)
• Visitor Q (2001)
• Brotherhood of the Wolf (2001)
• 28 Days Later (2002)
• Bubba Ho-tep (2002)
• Dog Soldiers (2002)
• Save the Green Planet (2003)
• A Tale of Two Sisters (2003)
• Shaun of the Dead (2004)
• Saw (2004)
• Night Watch (2004)
• Romasanta (2004)
• Survive Style 5+ (2004)
• Wolf Creek (2005)
• Feast (2005)
• Haze (2005)
• Slither (2006)
• Black Sheep (2006)
• Severance (2006)
• Fido (2006)
• The Cold Hour (2006)
• Re-cycle (2006)
• 30 Days of Night (2007)
• Timecrimes (2007)
• Inside (2007)
• Exte (2007)
• Tokyo Gore Police (2008)
• Martyrs (2008)
• Eden Lake (2008)
• Let The Right One In (2008)
• Midnight Meat Train (2008)
• Splinter (2008)
• Pontypool (2008)
• The Loved Ones (2009)
• Splice (2009)
• The Revenant (2009)
• The Collector (2009)
• Dead Snow (2009)
• The Horde (2009)
• Tucker and Dave vs Evil (2010)
• Rubber (2010)
• Stake Land (2010)
• Vampires (2010)
• The Cabin in the Woods (2011)
• Kill List (2011)
• Adam Chaplin (2011)
• You're Next (2011)
• Juan of the Dead (2011)
• Grabbers (2012)
• Stitches (2012)
• Under the Skin (2013)
• Only Lovers Left Alive (2013)
• Open Grave (2013)
• Frankenstein's Army (2013)
• V/H/S/2/ (2013)
• What We Do In the Shadows (2014)
• Housebound (2014)
• I Am Hero (2015)
• The Devil's Candy (2015)
• Train to Busan (2016)
• The Void (2016)
• The Greasy Strangler (2016)
• The Autopsy of Jane Doe (2016)
• Mayhem (2017)
• The Babysitter (2017)
• Anna and the Apocalypse (2017)
• Mandy (2018)
• Hereditary (2018)
• Apostle (2018)
• Overlord (2018)
• Psycho Goreman (2020)
• Spontaneous (2020)
• Titane (2021)
• Malignant (2021)
• The Sadness (2021)
• Silent Night (2021)
• Barbarian (2022)
• Day Shift (2022)
• Late Night With the Devil (2023)
• Strange Darling (2023)
• Longlegs (2024)
• In a Violent Nature (2024)
• I Saw The TV Glow (2024)