Games like Nightmare knock
Games like Nightmare knock include Firework, Tiny Bunny, Milk outside a bag of milk outside a bag of milk, KinitoPET, and MiSide. We matched them by the tags players give Nightmare knock on Steam (Action, Visual Novel, 3D, Text-Based, and 2D): closest matches first, and among equally close ones the better-known games.

Firework
Shared: Horror · 2D · Visual Novel

Tiny Bunny
Shared: Visual Novel · Horror · Psychological Horror

Milk outside a bag of milk outside a bag of milk
Shared: Visual Novel · Psychological Horror · 2D

KinitoPET
Shared: Psychological Horror · Horror · 2D

MiSide
Shared: Psychological Horror · 3D · Horror

Homicipher
Shared: Visual Novel · Horror · Text-Based

NEEDY STREAMER OVERLOAD
Shared: Visual Novel · Psychological Horror · 2D

Milk inside a bag of milk inside a bag of milk
Shared: Visual Novel · Psychological Horror · Horror

Urban Myth Dissolution Center
Shared: Visual Novel · Psychological Horror · 2D

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

OMORI
Shared: Psychological Horror · Indie · 2D

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Psychological Horror · Horror

Five Nights at Freddy's: Security Breach
Shared: Horror · 3D · Action

Scarlet Hollow
Shared: Visual Novel · Psychological Horror · Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · 3D

Darkwood
Shared: Action · Horror · Psychological Horror

SILENT HILL 2
Shared: Psychological Horror · Horror · Atmospheric

Alan Wake
Shared: Action · Horror · Atmospheric

Garten of Banban
Shared: Horror · Psychological Horror · 3D

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

Doki Doki Literature Club Plus!
Shared: Visual Novel · Psychological Horror · 2D

The Coma 2: Vicious Sisters
Shared: Action · Horror · 2D

Neverending Nightmares
Shared: Psychological Horror · Horror · Action