Games like Backrooms: Partygoers
Games like Backrooms: Partygoers include Poppy Playtime, Buckshot Roulette, Outlast, Garten of Banban, and Bendy and the Ink Machine. We matched them by the tags players give Backrooms: Partygoers on Steam (Horror, Singleplayer, First-Person, Puzzle, and 3D): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Singleplayer · Puzzle

Buckshot Roulette
Shared: Horror · First-Person · Dark

Outlast
Shared: Horror · First-Person · Singleplayer

Garten of Banban
Shared: Horror · Singleplayer · First-Person

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

MiSide
Shared: Horror · Psychological Horror · First-Person

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

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

Outlast 2
Shared: Horror · First-Person · Singleplayer

Little Nightmares II
Shared: Horror · Singleplayer · Puzzle

SOMA
Shared: Horror · Psychological Horror · Dark

Inside the Backrooms
Shared: Horror · Puzzle · Psychological Horror

Garten of Banban 2
Shared: Horror · Singleplayer · First-Person

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

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

Five Nights at Freddy's
Shared: Horror · Singleplayer · Psychological Horror

The Forest
Shared: Horror · First-Person · Survival

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

Garten of Banban 3
Shared: Horror · Singleplayer · First-Person

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

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

Portal 2
Shared: Singleplayer · First-Person · Puzzle

Little Nightmares
Shared: Horror · Singleplayer · Puzzle

MADiSON
Shared: Horror · First-Person · Dark