Games like Ten Days Nightmare
Games like Ten Days Nightmare include Poppy Playtime, Outer Wilds, The Exit 8, Inside the Backrooms, and Blue Prince. We matched them by the tags players give Ten Days Nightmare on Steam (Psychological Horror, Simulation, Puzzle, Adventure, and Mystery): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Puzzle · Psychological Horror · First-Person

Outer Wilds
Shared: Mystery · Adventure · Exploration

The Exit 8
Shared: Puzzle · Psychological Horror · Exploration

Inside the Backrooms
Shared: Psychological Horror · Puzzle · Adventure

Blue Prince
Shared: Puzzle · Mystery · Exploration

Platform 8
Shared: Psychological Horror · Simulation · Adventure

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

MOLE
Shared: Simulation · Psychological Horror · Adventure

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

MiSide
Shared: Psychological Horror · First-Person · Adventure

[Chillas Art] The Convenience Store
Shared: Psychological Horror · Simulation · Adventure

Superliminal
Shared: Puzzle · First-Person · Psychological

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

The Test
Shared: Simulation · Psychological Horror · Psychological

Scanner Sombre
Shared: Psychological Horror · Adventure · Exploration

The Room Two
Shared: Puzzle · Mystery · Adventure

DREDGE
Shared: Adventure · Exploration · Psychological Horror

The Room 4: Old Sins
Shared: Puzzle · Mystery · Adventure

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

Firewatch
Shared: Adventure · Mystery · First-Person

The Room Three
Shared: Puzzle · Adventure · Mystery

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

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

INFRA
Shared: Puzzle · Exploration · Adventure