Games like Separium: 12th Elevator
Games like Separium: 12th Elevator include Firewatch, The Room, What Remains of Edith Finch, The Room Three, and The Room Two. We matched them by the tags players give Separium: 12th Elevator on Steam (Adventure, God Game, Puzzle, Walking Simulator, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Atmospheric

The Room
Shared: Puzzle · Adventure · Hidden Object

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · First-Person

The Room Three
Shared: Adventure · Puzzle · Hidden Object

The Room Two
Shared: Puzzle · Adventure · Hidden Object

Quern - Undying Thoughts
Shared: Adventure · Puzzle · Walking Simulator

The Room 4: Old Sins
Shared: Puzzle · Adventure · Hidden Object

Riven
Shared: Adventure · Puzzle · First-Person

Platform 8
Shared: Adventure · Walking Simulator · Puzzle

The Talos Principle 2
Shared: Puzzle · Walking Simulator · First-Person

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

Outer Wilds
Shared: Adventure · Puzzle · Mystery

Aurora Hills: Chapter 1
Shared: Adventure · Puzzle · Hidden Object

A Story About My Uncle
Shared: Adventure · First-Person · Puzzle

The Witness
Shared: Puzzle · First-Person · Adventure

Boxes: Lost Fragments
Shared: Puzzle · Adventure · 3D

The Stanley Parable
Shared: Walking Simulator · Adventure · First-Person

Obduction
Shared: Adventure · Puzzle · Walking Simulator

INFRA
Shared: Puzzle · Adventure · Walking Simulator

Portal
Shared: Puzzle · 3D Platformer · First-Person

The Talos Principle
Shared: Puzzle · First-Person · Adventure

The Death | Thần Trùng
Shared: Puzzle · Adventure · Walking Simulator

The Last Campfire
Shared: Adventure · Puzzle · Atmospheric

Return of the Obra Dinn
Shared: Puzzle · Adventure · Mystery