Games like Ninth Hotel
Games like Ninth Hotel include The Cabin Factory, VERGE:Lost chapter, That's not my Neighbor, Five Nights at Freddy's: Security Breach, and Killer Frequency. We matched them by the tags players give Ninth Hotel on Steam (Horror, Simulation, Adventure, Singleplayer, and Choices Matter): closest matches first, and among equally close ones the better-known games.

The Cabin Factory
Shared: Horror · Choices Matter · Adventure

VERGE:Lost chapter
Shared: Horror · Adventure · Simulation

That's not my Neighbor
Shared: Adventure · Horror · Choices Matter

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Adventure

Killer Frequency
Shared: Horror · Adventure · Simulation

Firewatch
Shared: Adventure · Singleplayer · Walking Simulator

Little Nightmares
Shared: Horror · Adventure · Singleplayer

No, I'm not a Human
Shared: Horror · Choices Matter · Singleplayer

Totally Accurate Battle Simulator
Shared: Simulation · Singleplayer · Adventure

MiSide
Shared: Horror · Singleplayer · 3D

SchoolBoy Runaway
Shared: Simulation · Adventure · Horror

Little Nightmares II
Shared: Horror · Adventure · Singleplayer

The Forest
Shared: Horror · Adventure · Singleplayer

The Test
Shared: Simulation · Singleplayer · Horror

Poppy Playtime
Shared: Horror · Singleplayer · Adventure

Layers of Fear (2016)
Shared: Horror · Singleplayer · Walking Simulator

Summon
Shared: Simulation · Horror · Choices Matter

Scanner Sombre
Shared: Horror · Adventure · Walking Simulator

[Chillas Art] The Convenience Store
Shared: Horror · Adventure · Simulation

Escape the Backrooms
Shared: Horror · Adventure · Singleplayer

Quarantine Zone: The Last Check
Shared: Simulation · Singleplayer · Choices Matter

Little Misfortune
Shared: Horror · Adventure · Choices Matter

This War of Mine
Shared: Singleplayer · Simulation · Choices Matter

The Walking Dead
Shared: Adventure · Horror · Choices Matter