Games like Cul-De-Sac
Games like Cul-De-Sac include Phasmophobia, Poppy Playtime, Metel - Horror Escape, Platform 8, and Inside the Backrooms. We matched them by the tags players give Cul-De-Sac on Steam (Immersive, Horror, Investigation, Hidden Object, and Puzzle): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Investigation · Psychological Horror

Poppy Playtime
Shared: Horror · Puzzle · Psychological Horror

Metel - Horror Escape
Shared: Horror · Puzzle · Hidden Object

Platform 8
Shared: Puzzle · Hidden Object · Psychological Horror

Inside the Backrooms
Shared: Horror · Puzzle · Psychological Horror

The Exit 8
Shared: Horror · Puzzle · Exploration

The Room Two
Shared: Puzzle · Horror · Hidden Object

The Painscreek Killings
Shared: Investigation · Horror · Puzzle

Dead Signal
Shared: Horror · Hidden Object · Simulation

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Realistic

Buckshot Roulette
Shared: Horror · First-Person · Dark

MiSide
Shared: Horror · Psychological Horror · First-Person

Garten of Banban
Shared: Horror · Puzzle · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Exploration

Blue Prince
Shared: Puzzle · Investigation · Exploration

Demonologist
Shared: Horror · Investigation · Psychological Horror

MOLE
Shared: Horror · Simulation · Puzzle

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

Lethal Company
Shared: Horror · First-Person · Psychological Horror

Firework
Shared: Horror · Puzzle · Psychological Horror

The Room
Shared: Puzzle · Hidden Object · Horror

Summon
Shared: Horror · Simulation · Puzzle

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

A Game About Digging A Hole
Shared: Horror · Sandbox · Exploration