Support

Most problems are one of these. If yours isn't, use the form at the bottom or ask on Discord.

Won't start or crashed Playing with friends Controllers Runs slow Early Access Refunds Contact

It won't start, or it crashed

  1. Update your graphics drivers.
  2. In Steam, right-click Boomsday, then Properties, Installed Files, Verify integrity of game files.
  3. If it crashed, open the game again. It shows the crash report: hit send, or copy it into Discord. That's how we find the bug.

If we ask for your logs, they're here:

Playing with friends

Up to 8 people online. Two ways in:

For two players on one screen, plug in a controller. One person plays on mouse and keyboard, the other on the pad.

Controllers

Every platform supports them, and you can remap everything in Settings. On Steam Deck the controls are already set up.

It runs slow

  1. Lower the graphics settings in Settings.
  2. On PC, turn off Ground Mist. It's the most expensive effect.
  3. Close anything else that's using the GPU, like a browser full of video.

If it's still bad, send us your PC specs and what was on screen through the form below.

Early Access

Boomsday is in Early Access, so it gets updated a lot. Steam installs the updates on its own.

There's also a free demo on the Steam page: Classic and the tutorial, solo, as Smoke, up to the first boss.

Refunds

Steam handles them, under Steam's normal refund policy. Ask through your Steam account.

Still stuck?

Tell us what happened. Platform, mode and what you were doing all help.

BOOMSDAY © 2026 Floor Wardens. In Early Access. Everything may change; the blood stays.

Steam® is a trademark of Valve Corporation. Google Play and App Store availability follows mobile testing.