Games like Twelve Boxes
Games like Twelve Boxes include Papers, Please, SchoolBoy Runaway, Escape Simulator, Platform 8, and Dollmare. We matched them by the tags players give Twelve Boxes on Steam (Puzzle, Simulation, Walking Simulator, Hidden Object, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Papers, Please
Shared: Simulation · Puzzle · Singleplayer

SchoolBoy Runaway
Shared: Puzzle · Simulation · First-Person

Escape Simulator
Shared: Puzzle · First-Person · Simulation

Platform 8
Shared: Walking Simulator · Simulation · Puzzle

Dollmare
Shared: Simulation · Walking Simulator · First-Person

The Exit 8
Shared: Puzzle · Walking Simulator · First-Person

The Witness
Shared: Puzzle · First-Person · Singleplayer

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

The Room
Shared: Puzzle · Singleplayer · Hidden Object

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

Poly Bridge
Shared: Simulation · Puzzle · Singleplayer

Portal 2
Shared: Puzzle · Singleplayer · First-Person

Electrician Simulator
Shared: Simulation · First-Person · Singleplayer

Librarian: Tidy Up the Arcane Library!
Shared: Puzzle · Singleplayer · Simulation

Garten of Banban
Shared: Puzzle · Singleplayer · First-Person

The Room Three
Shared: Puzzle · Hidden Object · Singleplayer

Killer Frequency
Shared: Puzzle · Simulation · Walking Simulator

Poppy Playtime
Shared: Puzzle · Singleplayer · First-Person

Contraband Police
Shared: Simulation · Singleplayer · First-Person

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · Multiple Endings · First-Person

KovaaK's
Shared: Simulation · First-Person · Singleplayer

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

Portal
Shared: Puzzle · First-Person · Singleplayer

Slime Rancher 2
Shared: Singleplayer · Simulation · First-Person