Games like Connection: The Nightmare Within
Games like Connection: The Nightmare Within include Alan Wake, Resident Evil 2, Poppy Playtime, Murdered: Soul Suspect, and Sherlock Holmes: The Devil's Daughter. We matched them by the tags players give Connection: The Nightmare Within on Steam (Action, Horror, Adventure, Mystery, and Puzzle): closest matches first, and among equally close ones the better-known games.

Alan Wake
Shared: Action · Horror · Adventure

Resident Evil 2
Shared: Horror · Action · Third Person

Poppy Playtime
Shared: Horror · Puzzle · Mystery

Murdered: Soul Suspect
Shared: Adventure · Mystery · Horror

Sherlock Holmes: The Devil's Daughter
Shared: Adventure · Mystery · Puzzle

Resident Evil 4
Shared: Action · Horror · Survival Horror

Alan Wake's American Nightmare
Shared: Action · Horror · Adventure

The Evil Within 2
Shared: Horror · Action · Adventure

Resident Evil 7 Biohazard
Shared: Horror · Action · Survival Horror

Little Nightmares II
Shared: Horror · Adventure · Puzzle

Little Nightmares
Shared: Horror · Adventure · Atmospheric

Resident Evil 4 (2005)
Shared: Action · Horror · Adventure

Resident Evil 0
Shared: Horror · Adventure · Action

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Darkwood
Shared: Horror · Adventure · Action

Batman™: Arkham Knight
Shared: Action · Adventure · Third Person

Outlast
Shared: Horror · Atmospheric · Action

Resident Evil 3
Shared: Action · Horror · Zombies

Resident Evil Village
Shared: Horror · Action · Survival Horror

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

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

The Evil Within
Shared: Horror · Action · Atmospheric

Tomb Raider Game of the Year
Shared: Action · Adventure · Third Person

Tormented Souls
Shared: Horror · Action · Puzzle