Open now · Join instantly
SUBFAULT playtest
by Ian Hamm, THE.PROJECT Development Studio
A cat-and-mouse style horror game where you descend into a rundown facility to service faulty subsystems. Exercise caution - you're not alone down there.
Anyone with a Steam account can join, and it's free.
- Access
- Instant
- On playtest since
- Nov 12, 2025
- Released
- Jan 6, 2026
- Developer
- Ian Hamm, THE.PROJECT Development Studio
- Platforms
- Windows
- Players
- Single-player
- Languages
- English
How to join the SUBFAULT playtest
- Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
- Use the SUBFAULT playtest signup there. You're in straight away, with nothing to pay.
- The playtest shows up in your Steam library, ready to install and play.
New to playtests? How Steam playtests work
About SUBFAULT
Employed by a sinister authority, you take on the role of a glorified handyman - tasked with upkeeping various subsystems in dangerous environments.
Get in, do your thing, then get out.
Each run you'll find yourself on is tailored by you.
You get to choose which;
LEVEL to visit,
GAMEMODE to play,
MONSTER to hide from,
and DIFFICULTY to suffer through.
Your brave work does not go unnoticed!
- Complete levels and gamemode objectives to be rewarded with Exp and Cash.
- Gain Exp to level up and earn Skill Tokens to improve your servicing and survival abilities.
- Earn Cash to purchase Specialty Items and upgrades to help ensure you leave work in one piece.
Be careful - if you fail to complete a level (i.e. you die)... you don't get paid!
The awesome features listed below are planned and are NOT currently in-game.
- More ways to mix and match: 25+ levels, 10+ gamemodes, 10+ monsters, and 5 difficulties overall.
- Online multiplayer: Host or join lobbies with your friends.
- The Shaft: Play an infinite series of procedurally generated levels, with its own optional progression.
- Level editor & Workshop: Create and share levels on the Steam Workshop.
And more...
From the game's Steam page.
