Games like THE ILLUSION: NIGHTMARE
Games like THE ILLUSION: NIGHTMARE include Inside the Backrooms, Poppy Playtime, Escape the Backrooms, SOMA, and Lethal Company. We matched them by the tags players give THE ILLUSION: NIGHTMARE on Steam (Horror, Survival Horror, Puzzle, Adventure, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Inside the Backrooms
Shared: Horror · Survival Horror · Puzzle

Poppy Playtime
Shared: Horror · Puzzle · Survival Horror

Escape the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Exploration

Backrooms: Escape Together
Shared: Horror · Survival Horror · Psychological Horror

Amnesia: The Dark Descent
Shared: Horror · Survival Horror · Psychological Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Ghost Watchers
Shared: Horror · Survival Horror · Adventure

Darkwood
Shared: Horror · Survival Horror · Adventure

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

Garten of Banban
Shared: Horror · Psychological Horror · Puzzle

Platform 8
Shared: Adventure · Psychological Horror · Puzzle

Resident Evil Requiem
Shared: Survival Horror · Horror · First-Person

Subnautica 2
Shared: Horror · Survival Horror · Exploration

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Exploration

Metel - Horror Escape
Shared: Horror · Puzzle · Survival Horror

The Forest
Shared: Horror · Adventure · Survival Horror

The Exit 8
Shared: Puzzle · Horror · Exploration

Visage
Shared: Horror · Survival Horror · Psychological Horror

SILENT HILL: Townfall
Shared: Horror · Adventure · Survival Horror

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

ROUTINE
Shared: Psychological Horror · Horror · Adventure

Pacify
Shared: Horror · Survival Horror · Psychological Horror