Games like Black Light Kills
Games like Black Light Kills include Poppy Playtime, Mouthwashing, Phasmophobia, No, I'm not a Human, and Demonologist. We matched them by the tags players give Black Light Kills on Steam (Action-Adventure, First-Person, Thriller, Surreal, and Mystery): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: First-Person · Horror · Dark

Mouthwashing
Shared: Horror · Psychological Horror · Surreal

Phasmophobia
Shared: Horror · First-Person · Psychological Horror

No, I'm not a Human
Shared: Horror · First-Person · Psychological Horror

Demonologist
Shared: First-Person · Horror · Dark

Superliminal
Shared: First-Person · Surreal · Thriller

Buckshot Roulette
Shared: First-Person · Dark · Horror

The Mortuary Assistant
Shared: Mystery · Demons · Horror

Outlast
Shared: First-Person · Horror · Psychological Horror

Outlast 2
Shared: First-Person · Horror · Psychological Horror

Amnesia: Rebirth
Shared: Action-Adventure · First-Person · Horror

MiSide
Shared: First-Person · Psychological Horror · Horror

Ghostwire: Tokyo
Shared: First-Person · Action-Adventure · Horror

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

Firewatch
Shared: First-Person · Mystery · Story Rich

Little Nightmares II
Shared: Horror · Dark · Action-Adventure

Notch - The Innocent LunA: Eclipsed SinnerS
Shared: Surreal · Horror · Mystery

SOMA
Shared: Horror · Dark · First-Person

Garten of Banban
Shared: First-Person · Horror · Psychological Horror

What Remains of Edith Finch
Shared: First-Person · Mystery · Story Rich

Pacify
Shared: Horror · First-Person · Psychological Horror

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

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

Locked Up
Shared: First-Person · Horror · Psychological Horror

