Games like HorrorDungeon
Games like HorrorDungeon include Resident Evil 7 Biohazard, Outlast, Resident Evil Village, Poppy Playtime, and Outlast 2. We matched them by the tags players give HorrorDungeon on Steam (First-Person, Action-Adventure, Adventure, Action, and Thriller): closest matches first, and among equally close ones the better-known games.

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

Outlast
Shared: First-Person · Horror · Survival Horror

Resident Evil Village
Shared: First-Person · Action · Singleplayer

Poppy Playtime
Shared: First-Person · Singleplayer · Horror

Outlast 2
Shared: First-Person · Horror · Singleplayer

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

The Beast Inside
Shared: First-Person · Adventure · Horror

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

Bendy and the Dark Revival
Shared: First-Person · Action · Singleplayer

Escape the Backrooms
Shared: First-Person · Horror · Adventure

Atomic Heart
Shared: Adventure · Action · Action-Adventure

Amnesia: The Dark Descent
Shared: First-Person · Gore · Horror

The Forest
Shared: Adventure · First-Person · Horror

SILENT HILL: Townfall
Shared: Adventure · First-Person · Action

Amnesia: Rebirth
Shared: First-Person · Action-Adventure · Adventure

Hello Neighbor 2
Shared: Adventure · First-Person · Action-Adventure

The Evil Within 2
Shared: Horror · Action · Adventure

Five Nights at Freddy's: Secret of the Mimic
Shared: First-Person · Adventure · Action

Dead by Daylight
Shared: Horror · Gore · Survival Horror

Dark Deception
Shared: First-Person · Horror · Singleplayer

Resident Evil 2
Shared: Singleplayer · Horror · Survival Horror

Resident Evil 4
Shared: Action · Horror · Singleplayer

Portal 2
Shared: First-Person · Singleplayer · Action-Adventure

SOMA
Shared: Horror · First-Person · Psychological Horror