Games like Sapper's bad dream
Games like Sapper's bad dream include Poppy Playtime, Outlast, Escape the Backrooms, The Outlast Trials, and Dying Light. We matched them by the tags players give Sapper's bad dream on Steam (Mystery Dungeon, Mining, Horror, Action, and Mystery): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Mystery · Psychological Horror

Outlast
Shared: Horror · Psychological Horror · First-Person

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

The Outlast Trials
Shared: Horror · Psychological Horror · Action

Dying Light
Shared: Horror · Action · Zombies

Bendy and the Dark Revival
Shared: Horror · Action · Indie

Resident Evil 7 Biohazard
Shared: Horror · Action · First-Person

Lethal Company
Shared: Horror · Psychological Horror · First-Person

The Beast Inside
Shared: Horror · Action · Adventure

We Happy Few
Shared: Action · Adventure · Indie

Bendy and the Ink Machine
Shared: Horror · First-Person · Indie

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

Resident Evil Village
Shared: Horror · Action · First-Person

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

Inside the Backrooms
Shared: Horror · Psychological Horror · Adventure

The Forest
Shared: Horror · Action · Adventure

Dark Deception
Shared: Horror · Psychological Horror · Action

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

Firework
Shared: Horror · Indie · Mystery

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

The Room Two
Shared: Mystery · Horror · Indie

Penumbra Overture
Shared: Horror · Indie · Adventure

Maid of Sker
Shared: Horror · Action · Adventure

The Hat Man: Shadow Ward
Shared: Horror · Indie · Action