Games like The Undermall
Games like The Undermall include Poppy Playtime, MiSide, The Room Two, Escape the Backrooms, and The Room. We matched them by the tags players give The Undermall on Steam (Hidden Object, Casual, Psychological Horror, Horror, and Puzzle): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · First-Person

The Room Two
Shared: Hidden Object · Puzzle · Horror

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

The Room
Shared: Puzzle · Hidden Object · Adventure

The Death | Thần Trùng
Shared: Psychological Horror · Horror · Puzzle

Garten of Banban
Shared: Horror · Psychological Horror · Puzzle

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

Inside the Backrooms
Shared: Horror · Psychological Horror · Puzzle

Little Nightmares II
Shared: Horror · Adventure · Puzzle

The Room Three
Shared: Puzzle · Adventure · Hidden Object

The Room 4: Old Sins
Shared: Puzzle · Hidden Object · Adventure

The Exit 8
Shared: Puzzle · Horror · Psychological Horror

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

Little Nightmares
Shared: Horror · Adventure · Puzzle

Outlast
Shared: Horror · Psychological Horror · First-Person

Garten of Banban 2
Shared: Horror · Psychological Horror · Puzzle

Fran Bow
Shared: Psychological Horror · Horror · Puzzle

SchoolBoy Runaway
Shared: Puzzle · Horror · Adventure

Buckshot Roulette
Shared: Horror · First-Person · Psychological Horror

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

Layers of Fear (2016)
Shared: Psychological Horror · Horror · First-Person

Platform 8
Shared: Psychological Horror · Hidden Object · Adventure

No, I'm not a Human
Shared: Psychological Horror · Horror · Indie