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

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

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

Phasmophobia
Shared: Horror · Online Co-Op · Psychological Horror

Pacify
Shared: Horror · Online Co-Op · Psychological Horror

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

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

Zort
Shared: Horror · Online Co-Op · Psychological Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Online Co-Op

Demonologist
Shared: Horror · Online Co-Op · Psychological Horror

PEAK
Shared: Online Co-Op · Adventure · Exploration

Five Nights at Freddy's: Security Breach
Shared: Horror · Multiple Endings · Exploration

A Way Out
Shared: Online Co-Op · Local Co-Op · Adventure

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

Resident Evil 5
Shared: Online Co-Op · Horror · Action

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

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

Resident Evil 6
Shared: Horror · Online Co-Op · Action

SILENT HILL f
Shared: Horror · Psychological Horror · Action

Darkwood
Shared: Horror · Psychological Horror · Adventure

BIGFOOT
Shared: Horror · Online Co-Op · Psychological Horror

It Takes Two
Shared: Online Co-Op · Local Co-Op · Adventure

SILENT HILL: Townfall
Shared: Horror · Psychological Horror · Adventure

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

SILENT HILL 2
Shared: Horror · Psychological Horror · Multiple Endings