Games like UnderBackrooms
Games like UnderBackrooms include Dead by Daylight, Backrooms: Escape Together, Escape the Backrooms, Outlast, and Inside the Backrooms. We matched them by the tags players give UnderBackrooms on Steam (Adventure, Indie, Early Access, Gore, and Violent): closest matches first, and among equally close ones the better-known games.

Dead by Daylight
Shared: Gore · Multiplayer · Horror

Backrooms: Escape Together
Shared: Multiplayer · Online Co-Op · Horror

Escape the Backrooms
Shared: Multiplayer · Horror · Online Co-Op

Outlast
Shared: Horror · Gore · Adventure

Inside the Backrooms
Shared: Multiplayer · Adventure · Horror

Outlast 2
Shared: Gore · Horror · Psychological Horror

DEVOUR
Shared: Multiplayer · Online Co-Op · Horror

The Beast Inside
Shared: Adventure · Horror · Multiplayer

Lethal Company
Shared: Online Co-Op · Horror · Survival Horror

BIGFOOT
Shared: Multiplayer · Horror · Online Co-Op

Home Sweet Home
Shared: Adventure · Gore · Indie

Phasmophobia
Shared: Multiplayer · Online Co-Op · Horror

PEAK
Shared: Adventure · Multiplayer · Online Co-Op

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

Nuclear Nightmare
Shared: Online Co-Op · Horror · Multiplayer

Visage
Shared: Horror · Adventure · Multiplayer

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

Dying Light
Shared: Online Co-Op · Horror · Survival Horror

Halloween: The Game
Shared: Multiplayer · Violent · Horror

Granny
Shared: Multiplayer · Horror · Indie

Don't Starve Together
Shared: Adventure · Multiplayer · Indie

Subnautica 2
Shared: Multiplayer · Horror · Adventure

Blair Witch
Shared: Adventure · Indie · Horror

Content Warning
Shared: Online Co-Op · Horror · Multiplayer

