Games like Nightmare Halls
Games like Nightmare Halls include Outlast, Poppy Playtime, Outlast 2, Buckshot Roulette, and Resident Evil Village. We matched them by the tags players give Nightmare Halls on Steam (Action, Adventure, Interactive Fiction, 3D Platformer, and First-Person): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: First-Person · Horror · Psychological Horror

Poppy Playtime
Shared: Horror · First-Person · Dark

Outlast 2
Shared: Horror · First-Person · Psychological Horror

Buckshot Roulette
Shared: Dark · First-Person · Horror

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

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

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

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

Still Wakes the Deep
Shared: Horror · First-Person · Psychological Horror

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

We Happy Few
Shared: Adventure · Action · First-Person

SOMA
Shared: Horror · Psychological Horror · Dark

Little Nightmares II
Shared: Adventure · Horror · Dark

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

Thief
Shared: Action · Adventure · First-Person

Slender: The Arrival
Shared: First-Person · Horror · Dark

The Forest
Shared: Adventure · Horror · Action

Paper Dolls: Original /
Shared: Adventure · Action · Horror

IMSCARED
Shared: Adventure · Horror · First-Person

Darkwood
Shared: Adventure · Action · Horror

Bendy and the Ink Machine
Shared: First-Person · Horror · Dark

Spooky's Jump Scare Mansion: HD Renovation
Shared: Adventure · Action · Horror

Alan Wake
Shared: Action · Adventure · Horror

Dark Deception
Shared: Horror · First-Person · Action