Games like Poppy Playtime
Games like Poppy Playtime include Outlast, Ultimate Custom Night, Bendy and the Ink Machine, Garten of Banban, and Resident Evil 7 Biohazard. We matched them by the tags players give Poppy Playtime on Steam (Horror, Singleplayer, Free to Play, Puzzle, and First-Person): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · First-Person · Survival Horror

Ultimate Custom Night
Shared: Horror · Free to Play · Singleplayer

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

Garten of Banban
Shared: Horror · Singleplayer · First-Person

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

Outlast 2
Shared: Horror · Singleplayer · First-Person

Dark Deception
Shared: Horror · Free to Play · Singleplayer

Five Nights at Freddy's
Shared: Horror · Singleplayer · Survival Horror

Bendy and the Dark Revival
Shared: Horror · Singleplayer · First-Person

Five Nights at Freddy's 2
Shared: Horror · Singleplayer · Survival Horror

Resident Evil Village
Shared: Horror · Singleplayer · Survival Horror

Garten of Banban 2
Shared: Horror · Singleplayer · Puzzle

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

SOMA
Shared: Horror · Psychological Horror · Survival Horror

Little Nightmares II
Shared: Horror · Singleplayer · Puzzle

Five Nights at Freddy's: Sister Location
Shared: Horror · Singleplayer · Survival Horror

Little Nightmares
Shared: Horror · Singleplayer · Puzzle

Garten of Banban 3
Shared: Horror · Singleplayer · First-Person

Five Nights at Freddy's 4
Shared: Horror · Singleplayer · Survival Horror

Five Nights at Freddy's 3
Shared: Horror · Singleplayer · Survival Horror

Slender: The Arrival
Shared: Horror · First-Person · Survival Horror

MADiSON
Shared: Horror · First-Person · Puzzle

FIVE NIGHTS AT FREDDY'S: HELP WANTED
Shared: Horror · Singleplayer · First-Person

Inside the Backrooms
Shared: Horror · Puzzle · Survival Horror