Games like Locked in a room while: Visiting an old Castle
Games like Locked in a room while: Visiting an old Castle include Escape Simulator, The Room 4: Old Sins, Blue Prince, The Room, and The Room VR: A Dark Matter. We matched them by the tags players give Locked in a room while: Visiting an old Castle on Steam (Simulation, Adventure, Escape Room, Puzzle, and Medieval): closest matches first, and among equally close ones the better-known games.

Escape Simulator
Shared: Puzzle · Escape Room · Adventure

The Room 4: Old Sins
Shared: Adventure · Puzzle · Escape Room

Blue Prince
Shared: Puzzle · Mystery · Adventure

The Room
Shared: Puzzle · Adventure · Mystery

The Room VR: A Dark Matter
Shared: Adventure · VR · Puzzle

BONEWORKS
Shared: VR · Adventure · Puzzle

The Room Three
Shared: Adventure · Puzzle · Mystery

The House of Da Vinci
Shared: Puzzle · Hidden Object · Adventure

The Room Two
Shared: Puzzle · Adventure · Mystery

Slime Rancher
Shared: Adventure · Simulation · Singleplayer

Microsoft Flight Simulator (2020) 40th Anniversary Edition
Shared: Simulation · VR · Adventure

Outer Wilds
Shared: Adventure · Mystery · Puzzle

We Were Here
Shared: Escape Room · Puzzle · Adventure

The House of Da Vinci 2
Shared: Puzzle · Hidden Object · Mystery

X-Plane 11
Shared: Simulation · VR · Adventure

SchoolBoy Runaway
Shared: Adventure · Simulation · Puzzle

Strange Horticulture
Shared: Puzzle · Mystery · Simulation

Totally Accurate Battle Simulator
Shared: Simulation · Adventure · Singleplayer

I Expect You To Die 2: The Spy and the Liar
Shared: VR · Puzzle · Adventure

Riven
Shared: Adventure · Puzzle · VR

I Expect You To Die 3: Cog in the Machine
Shared: Adventure · Simulation · VR

Servant of the Lake
Shared: Adventure · Puzzle · Escape Room

Blade and Sorcery
Shared: VR · Simulation · Medieval

Quern - Undying Thoughts
Shared: Adventure · Puzzle · Mystery