Games like Abnormality
Games like Abnormality include Phasmophobia, Pacify, Escape the Backrooms, Backrooms: Escape Together, and Inside the Backrooms. We matched them by the tags players give Abnormality on Steam (Horror, Multiplayer, Psychological Horror, Supernatural, and Exploration): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Multiplayer · Psychological Horror

Pacify
Shared: Horror · Multiplayer · Psychological Horror

Escape the Backrooms
Shared: Horror · Multiplayer · Psychological Horror

Backrooms: Escape Together
Shared: Horror · Multiplayer · Psychological Horror

Inside the Backrooms
Shared: Horror · Multiplayer · Psychological Horror

Subnautica 2
Shared: Multiplayer · Horror · Exploration

Lethal Company
Shared: Horror · First-Person · Co-op

The Outlast Trials
Shared: Horror · Multiplayer · Psychological Horror

Demonologist
Shared: Horror · Multiplayer · Psychological Horror

We Were Here
Shared: Multiplayer · Horror · Co-op

Labyrinthine
Shared: Horror · Multiplayer · Psychological Horror

Ghost Exorcism INC.
Shared: Horror · Multiplayer · Supernatural

PEAK
Shared: Multiplayer · Co-op · Exploration

Content Warning
Shared: Horror · Multiplayer · Exploration

R.E.P.O.
Shared: Horror · Multiplayer · Co-op

Dead by Daylight
Shared: Horror · Multiplayer · Co-op

DEVOUR
Shared: Horror · Multiplayer · Psychological Horror

Nuclear Nightmare
Shared: Horror · Psychological Horror · Multiplayer

Outlast
Shared: Horror · Psychological Horror · First-Person

Sons Of The Forest
Shared: Multiplayer · Horror · Co-op

Fears to Fathom® - Scratch Creek
Shared: Horror · Multiplayer · Psychological Horror

Buckshot Roulette
Shared: Multiplayer · Horror · First-Person

Ready or Not
Shared: Multiplayer · Horror · Psychological Horror

Fear Therapy
Shared: Horror · Multiplayer · Psychological Horror