Games like The Hallways
Games like The Hallways include Outlast, Firewatch, The Beast Inside, Blair Witch, and Resident Evil 7 Biohazard. We matched them by the tags players give The Hallways on Steam (Horror, First-Person, Walking Simulator, Adventure, and Hidden Object): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · First-Person · Singleplayer

Firewatch
Shared: Adventure · Walking Simulator · First-Person

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

Blair Witch
Shared: Horror · Adventure · First-Person

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

Outlast 2
Shared: Horror · First-Person · Singleplayer

Layers of Fear (2016)
Shared: Horror · Walking Simulator · First-Person

VERGE:Lost chapter
Shared: Horror · Walking Simulator · Adventure

Still Wakes the Deep
Shared: Horror · First-Person · Walking Simulator

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

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

Granny
Shared: Horror · First-Person · Singleplayer

Scorn
Shared: Horror · First-Person · Gore

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

Ready or Not
Shared: Horror · First-Person · Singleplayer

Granny: Chapter Two
Shared: Horror · Adventure · First-Person

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

What Remains of Edith Finch
Shared: Walking Simulator · First-Person · Adventure

The Forest
Shared: Horror · Adventure · First-Person

Home Sweet Home
Shared: Horror · Adventure · First-Person

Visage
Shared: Horror · First-Person · Singleplayer

Among the Sleep - Enhanced Edition
Shared: Horror · First-Person · Adventure

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

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