Games like Psychopath Massacre
Games like Psychopath Massacre include The Exit 8, Escape the Backrooms, Inside the Backrooms, Poppy Playtime, and Five Nights at Freddy's: Security Breach. We matched them by the tags players give Psychopath Massacre on Steam (Exploration, Puzzle, Parkour, Villain Protagonist, and First-Person): closest matches first, and among equally close ones the better-known games.

The Exit 8
Shared: Exploration · Puzzle · Horror

Escape the Backrooms
Shared: Horror · Exploration · First-Person

Inside the Backrooms
Shared: Puzzle · Horror · Exploration

Poppy Playtime
Shared: Puzzle · Horror · First-Person

Five Nights at Freddy's: Security Breach
Shared: Horror · Exploration · First-Person

Outlast
Shared: First-Person · Horror · Psychological Horror

Lethal Company
Shared: First-Person · Exploration · Horror

Backrooms: Escape Together
Shared: Horror · First-Person · Psychological Horror

Five Nights at Freddy's: Secret of the Mimic
Shared: First-Person · Exploration · Horror

Hello Neighbor 2
Shared: Puzzle · First-Person · Parkour

MiSide
Shared: First-Person · Psychological Horror · Horror

Scanner Sombre
Shared: Exploration · Horror · First-Person

Amnesia: The Dark Descent
Shared: Puzzle · Horror · First-Person

The Forest
Shared: Horror · Exploration · First-Person

Superliminal
Shared: Puzzle · First-Person · Exploration

Outer Wilds
Shared: Exploration · Puzzle · Adventure

Metel - Horror Escape
Shared: Puzzle · Horror · First-Person

Amnesia: Rebirth
Shared: Puzzle · First-Person · Exploration

SOMA
Shared: Horror · Exploration · Psychological Horror

Gorilla Tag
Shared: Parkour · First-Person · Psychological Horror

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

SILENT HILL: Townfall
Shared: Exploration · Horror · First-Person

Subnautica 2
Shared: Exploration · Horror · First-Person

R.E.P.O.
Shared: Horror · First-Person · 3D