Games like Test Subject 901
Games like Test Subject 901 include Ultimate Custom Night, Dark Deception, Buckshot Roulette, Where Winds Meet, and Poppy Playtime. We matched them by the tags players give Test Subject 901 on Steam (Free to Play, Strategy, Singleplayer, Horror, and Indie): closest matches first, and among equally close ones the better-known games.

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

Dark Deception
Shared: Free to Play · Horror · Singleplayer

Buckshot Roulette
Shared: Horror · Strategy · Multiplayer

Where Winds Meet
Shared: Free to Play · Singleplayer · Multiplayer

Poppy Playtime
Shared: Free to Play · Singleplayer · Horror

Granny
Shared: Horror · Singleplayer · Multiplayer

SMITE®
Shared: Free to Play · Strategy · Multiplayer

GWENT: The Witcher Card Game
Shared: Free to Play · Strategy · Multiplayer

Halo Infinite
Shared: Free to Play · Singleplayer · Multiplayer

Plague Inc: Evolved
Shared: Strategy · Singleplayer · Indie

Path of Exile
Shared: Free to Play · Multiplayer · Singleplayer

Phasmophobia
Shared: Horror · Multiplayer · VR

Delta Force
Shared: Free to Play · Singleplayer · Multiplayer

Age of Conquest IV
Shared: Free to Play · Strategy · Singleplayer

Emily Wants To Play
Shared: Horror · Indie · Strategy

Bloons TD 6
Shared: Strategy · Singleplayer · Multiplayer

Idle Champions of the Forgotten Realms
Shared: Free to Play · Strategy · Singleplayer

Mount & Blade II: Bannerlord
Shared: Strategy · Singleplayer · Multiplayer

Sid Meier’s Civilization® VI
Shared: Strategy · Singleplayer · Multiplayer

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · VR

Marvel Rivals
Shared: Free to Play · Multiplayer · Strategy

Age of Empires III: Definitive Edition
Shared: Strategy · Multiplayer · Free to Play

War Thunder
Shared: Free to Play · VR · Multiplayer

Once Human
Shared: Free to Play · Multiplayer · Strategy