Games like 18层
Games like 18层 include Poppy Playtime, Inside the Backrooms, MiSide, Firework, and Little Nightmares II. We matched them by the tags players give 18层 on Steam (Psychological Horror, Horror, Mystery, Puzzle, and Adventure): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · Psychological Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Puzzle

MiSide
Shared: Psychological Horror · Horror · First-Person

Firework
Shared: Horror · Puzzle · Psychological Horror

Little Nightmares II
Shared: Horror · Adventure · Puzzle

Escape the Backrooms
Shared: Horror · Psychological Horror · Adventure

Garten of Banban
Shared: Horror · Psychological Horror · Puzzle

Dread Flats
Shared: Horror · Psychological Horror · Adventure

The Exit 8
Shared: Horror · Puzzle · Psychological Horror

Sally Face - Episode One
Shared: Psychological Horror · Horror · Puzzle

The Room Two
Shared: Mystery · Puzzle · Horror

Outlast
Shared: Horror · Psychological Horror · First-Person

Bendy and the Ink Machine
Shared: Horror · Puzzle · Mystery

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · Puzzle

Platform 8
Shared: Psychological Horror · Adventure · Puzzle

Phasmophobia
Shared: Horror · Psychological Horror · Mystery

Garten of Banban 2
Shared: Horror · Psychological Horror · Puzzle

Amnesia: Rebirth
Shared: Puzzle · Horror · Action-Adventure

MOLE
Shared: Horror · Psychological Horror · Simulation

Hello Neighbor 2
Shared: Horror · Puzzle · Adventure

Little Nightmares
Shared: Horror · Adventure · Puzzle

SchoolBoy Runaway
Shared: Puzzle · Horror · Adventure

Outer Wilds
Shared: Mystery · Adventure · Puzzle

Hello Neighbor
Shared: Horror · First-Person · Action-Adventure