Games like Nonlinear Door 非线性之门
Games like Nonlinear Door 非线性之门 include Scarlet Idol, OMORI, THE 4 SINS, Fate Seeker II, and Lunacid. We matched them by the tags players give Nonlinear Door 非线性之门 on Steam (RPG, Dungeon Crawler, Puzzle, 3D, and Third Person): closest matches first, and among equally close ones the better-known games.

Scarlet Idol
Shared: Puzzle · Dungeon Crawler · RPG

OMORI
Shared: RPG · Psychological Horror · Multiple Endings

THE 4 SINS
Shared: RPG · Puzzle · 3D

Fate Seeker II
Shared: RPG · Puzzle · 3D

Lunacid
Shared: Dungeon Crawler · RPG · 3D

Subliminal
Shared: Psychological Horror · Dungeon Crawler · 3D

Who's Lila?
Shared: Psychological Horror · Puzzle · RPG

OneShot
Shared: Puzzle · Indie · Multiple Endings

Fear & Hunger 2: Termina
Shared: RPG · Dungeon Crawler · Psychological Horror

Fellowship
Shared: Dungeon Crawler · RPG · Third Person

Legend of Grimrock
Shared: RPG · Dungeon Crawler · Puzzle

Mirror 2: Project X
Shared: 3D · RPG · Multiple Endings

MiSide
Shared: Psychological Horror · 3D · Puzzle

Legend of Grimrock 2
Shared: RPG · Dungeon Crawler · Puzzle

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Third Person · Multiple Endings

Firework
Shared: Puzzle · Psychological Horror · Indie

OFF
Shared: RPG · Psychological Horror · Surreal

Darkest Dungeon®
Shared: Dungeon Crawler · RPG · Singleplayer

Antichamber
Shared: Puzzle · Surreal · Indie

Dungeons of Blood and Dream
Shared: Dungeon Crawler · RPG · 3D

Endacopia
Shared: Puzzle · Psychological Horror · Surreal

Garten of Banban
Shared: Puzzle · Psychological Horror · 3D

Cryptmaster
Shared: Dungeon Crawler · RPG · 3D

Cyber Manhunt
Shared: RPG · Puzzle · Indie