Games like Dark Past
Games like Dark Past include Phasmophobia, Pacify, Demonologist, Escape the Backrooms, and Backrooms: Escape Together. We matched them by the tags players give Dark Past on Steam (Horror, Online Co-Op, Multiplayer, Psychological Horror, and Investigation): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Online Co-Op · Multiplayer

Pacify
Shared: Horror · Online Co-Op · Multiplayer

Demonologist
Shared: Horror · Online Co-Op · Multiplayer

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

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

Ghost Exorcism INC.
Shared: Horror · Multiplayer · Investigation

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

DEVOUR
Shared: Horror · Online Co-Op · Multiplayer

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

Inside the Backrooms
Shared: Horror · Multiplayer · Psychological Horror

Dead by Daylight
Shared: Horror · Multiplayer · Online Co-Op

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

Labyrinthine
Shared: Horror · Online Co-Op · Multiplayer

The Outlast Trials
Shared: Horror · Multiplayer · Psychological Horror

Lunch Lady
Shared: Horror · Online Co-Op · Multiplayer

PEAK
Shared: Online Co-Op · Multiplayer · Exploration

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

Lost Lullabies: The Orphanage Chronicles
Shared: Horror · Online Co-Op · Multiplayer

Buckshot Roulette
Shared: Multiplayer · Horror · Dark

Project Unknown
Shared: Horror · Online Co-Op · Multiplayer

Ghost Janitors
Shared: Horror · Online Co-Op · Multiplayer

We Were Here
Shared: Horror · Multiplayer · Online Co-Op

Shift At Midnight
Shared: Horror · Online Co-Op · Multiplayer

Outlast
Shared: Horror · Psychological Horror · Multiplayer