Games like The Backrooms
Games like The Backrooms include Hades, Poppy Playtime, UnderMine, Hades II, and Bendy and the Dark Revival. We matched them by the tags players give The Backrooms on Steam (Action, Adventure, Action Roguelike, Puzzle, and Visual Novel): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Action · Roguelite

Poppy Playtime
Shared: Puzzle · First-Person · Adventure

UnderMine
Shared: Action Roguelike · Action · Roguelite

Hades II
Shared: Action · Action Roguelike · Roguelite

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

Dead Cells
Shared: Adventure · Action Roguelike · Roguelite

Outlast
Shared: First-Person · Adventure · Action

Gunfire Reborn
Shared: Roguelite · Action · Action Roguelike

KLETKA
Shared: Action · Adventure · First-Person

The Binding of Isaac
Shared: Action Roguelike · Action · Adventure

Wizard of Legend
Shared: Action Roguelike · Action · Dungeon Crawler

The Forest
Shared: Adventure · Action · First-Person

Little Nightmares II
Shared: Adventure · Puzzle · Atmospheric

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

Mortal Sin
Shared: Action Roguelike · Action · Dungeon Crawler

Delver
Shared: Action Roguelike · Dungeon Crawler · First-Person

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

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Roguelite

PEAK
Shared: Adventure · First-Person · Action Roguelike

Dreamscaper
Shared: Action · Action Roguelike · Roguelite

Cult of the Lamb
Shared: Action Roguelike · Dungeon Crawler · Roguelite

Little Nightmares
Shared: Adventure · Puzzle · Atmospheric

Heroes of Hammerwatch II
Shared: Action Roguelike · Action · Dungeon Crawler

Backrooms: Escape Together
Shared: First-Person · Adventure · Realistic