Games like 20 Doors
Games like 20 Doors include Poppy Playtime, Escape the Backrooms, Garten of Banban, Inside the Backrooms, and The Exit 8. We matched them by the tags players give 20 Doors on Steam (3D, First-Person, Psychological Horror, Surreal, and Horror): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · First-Person · Puzzle

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

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

Inside the Backrooms
Shared: Horror · Psychological Horror · Puzzle

The Exit 8
Shared: Horror · Psychological Horror · Puzzle

Outlast
Shared: First-Person · Horror · Psychological Horror

MiSide
Shared: Psychological Horror · First-Person · 3D

Lethal Company
Shared: First-Person · Horror · Psychological Horror

SILENT HILL: Townfall
Shared: Horror · Psychological Horror · First-Person

SOMA
Shared: Psychological Horror · Horror · First-Person

Five Nights at Freddy's: Secret of the Mimic
Shared: First-Person · Horror · 3D

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

Buckshot Roulette
Shared: First-Person · Horror · 3D

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

Amnesia: Rebirth
Shared: First-Person · Puzzle · Horror

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

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

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

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Little Nightmares II
Shared: Horror · Psychological Horror · Adventure

Outer Wilds
Shared: Exploration · Adventure · Puzzle

The Room Two
Shared: Puzzle · Horror · Mystery

IMSCARED
Shared: Psychological Horror · Horror · First-Person

Total Chaos
Shared: Psychological Horror · Action · Horror