Games like The subject: Protocol zero
Games like The subject: Protocol zero include Poppy Playtime, Outlast, Escape the Backrooms, Buckshot Roulette, and The Outlast Trials. We matched them by the tags players give The subject: Protocol zero on Steam (Psychological Horror, Horror, Survival Horror, Simulation, and Voice Control): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

Buckshot Roulette
Shared: Horror · First-Person · Dark

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

Outlast 2
Shared: Psychological Horror · Horror · Survival Horror

Resident Evil Requiem
Shared: Survival Horror · Horror · First-Person

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

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

Visage
Shared: Psychological Horror · Horror · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

Inside the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Psychological Horror · Horror · Survival Horror

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · First-Person

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

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

Resident Evil Village
Shared: Horror · Survival Horror · First-Person

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

Slender: The Arrival
Shared: Horror · Survival Horror · Psychological Horror

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · First-Person

MiSide
Shared: Psychological Horror · Horror · First-Person

Choo-Choo Charles
Shared: Survival Horror · Horror · First-Person

Garten of Banban 2
Shared: Horror · Psychological Horror · First-Person

MADiSON
Shared: Psychological Horror · Horror · Survival Horror