Games like Behind The Backrooms
Games like Behind The Backrooms include Escape the Backrooms, Inside the Backrooms, Phasmophobia, Lethal Company, and PEAK. We matched them by the tags players give Behind The Backrooms on Steam (Horror, Thriller, Puzzle, Exploration, and RPG): closest matches first, and among equally close ones the better-known games.

Escape the Backrooms
Shared: Horror · Co-op · First-Person

Inside the Backrooms
Shared: Horror · Puzzle · Co-op

Phasmophobia
Shared: Horror · Co-op · First-Person

Lethal Company
Shared: Horror · Co-op · First-Person

PEAK
Shared: Co-op · Exploration · First-Person

Poppy Playtime
Shared: Horror · Puzzle · First-Person

R.E.P.O.
Shared: Horror · Co-op · First-Person

Backrooms: Escape Together
Shared: Horror · Co-op · First-Person

We Were Here
Shared: Puzzle · Co-op · Horror

Subnautica 2
Shared: Horror · Exploration · Co-op

Pacify
Shared: Horror · Co-op · Exploration

The Past Within
Shared: Puzzle · Co-op · Horror

Escape Simulator
Shared: Puzzle · Co-op · First-Person

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

Outer Wilds
Shared: Exploration · Puzzle · Mystery

MiSide
Shared: Horror · First-Person · Thriller

Content Warning
Shared: Horror · Exploration · Co-op

The Forest
Shared: Horror · First-Person · Exploration

Sons Of The Forest
Shared: Co-op · Horror · Exploration

We Were Here Forever
Shared: Puzzle · Co-op · Exploration

Unheard - Voices of Crime
Shared: Thriller · Puzzle · Horror

Firework
Shared: Horror · Puzzle · Thriller

Dead by Daylight
Shared: Horror · Co-op · Team-Based

Labyrinthine
Shared: Horror · Co-op · Puzzle