Games like The 8th Day
Games like The 8th Day include Dead by Daylight, Outlast 2, Outlast, Resident Evil 7 Biohazard, and Amnesia: The Dark Descent. We matched them by the tags players give The 8th Day on Steam (Indie, Gore, Violent, Survival Horror, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Dead by Daylight
Shared: Gore · Survival Horror · Horror

Outlast 2
Shared: Survival Horror · Gore · Psychological Horror

Outlast
Shared: Survival Horror · Horror · Gore

Resident Evil 7 Biohazard
Shared: Survival Horror · Horror · Gore

Amnesia: The Dark Descent
Shared: Gore · Horror · Survival Horror

FAITH: The Unholy Trinity
Shared: Indie · Horror · Psychological Horror

Manhunt
Shared: Gore · Violent · Horror

The Evil Within 2
Shared: Survival Horror · Horror · Psychological Horror

Resident Evil Village
Shared: Survival Horror · Horror · Gore

DEVOUR
Shared: Horror · Survival Horror · Psychological Horror

Five Nights at Freddy's
Shared: Survival Horror · Indie · Horror

SOMA
Shared: Psychological Horror · Horror · Survival Horror

People Playground
Shared: Gore · Violent · Indie

Dead Space
Shared: Survival Horror · Horror · Gore

The Texas Chain Saw Massacre
Shared: Gore · Horror · Survival Horror

The Beast Inside
Shared: Horror · Survival Horror · Indie

The Outlast Trials
Shared: Horror · Survival Horror · Psychological Horror

Home Sweet Home
Shared: Gore · Indie · Horror

Granny
Shared: Survival Horror · Horror · Indie

Mouthwashing
Shared: Psychological Horror · Indie · Horror

Resident Evil 2
Shared: Survival Horror · Horror · Gore

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

[Chillas Art] Aka Manto
Shared: Indie · Violent · Gore

Blair Witch
Shared: Indie · Horror · Psychological Horror