Games like Harts
Games like Harts include Outlast, Poppy Playtime, Resident Evil 7 Biohazard, Outlast 2, and Scorn. We matched them by the tags players give Harts on Steam (Adventure, Gore, Violent, Indie, and Puzzle): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Gore · First-Person

Poppy Playtime
Shared: Horror · Puzzle · First-Person

Resident Evil 7 Biohazard
Shared: Horror · Gore · First-Person

Outlast 2
Shared: Gore · Horror · First-Person

Scorn
Shared: Gore · Horror · Puzzle

The Beast Inside
Shared: Adventure · Horror · First-Person

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

The Forest
Shared: Adventure · Horror · Survival

Granny
Shared: Horror · Adventure · Puzzle

CARRION
Shared: Gore · Indie · Violent

MADiSON
Shared: Horror · Adventure · Puzzle

Dead by Daylight
Shared: Gore · Horror · Violent

Lucius
Shared: Adventure · Gore · Horror

Resident Evil Village
Shared: Horror · Gore · First-Person

Clive Barker's Hellraiser: Revival
Shared: Gore · Horror · Adventure

Blair Witch
Shared: Adventure · Horror · Indie

DOOM Eternal
Shared: Gore · Violent · Action

Bendy and the Dark Revival
Shared: Adventure · Horror · Indie

Little Nightmares II
Shared: Adventure · Horror · Puzzle

Agony UNRATED
Shared: Gore · Violent · Adventure

Granny: Chapter Two
Shared: Adventure · Gore · Indie

Little Nightmares
Shared: Adventure · Horror · Puzzle

Bendy and the Ink Machine
Shared: Horror · Puzzle · First-Person

Resident Evil 2
Shared: Horror · Gore · Puzzle

