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Survivalist: Invisible Strain

Also known as Survivalist: Invisible Strain, sis, steam:1054510

It's ten years since the infection started. Long-established settlements are collapsing, one by one, for unknown reasons. Survivors are running to the hills to escape, hoping for safety in remote places. As another refugee, you're here to carve out a new life for yourself - by any means necessary.

Last update
4 Aug 2026
Players now
300

Latest update

Patch notes

New small patch in publicbeta (v283)

Hello, just a small publicbeta update with a fix for an occasional crash if something gets deleted while you are repairing it, and a fix for the SIS Move Props mod, which it seems got broken by a change I made back in 2…

5 changesFixGameplayRead patch notes

Update history

Browse past updates and patch notes for this game.

22 updates

Gallery

In-game media

Achievements

Community progression

Top picks from 33 Steam achievements, sorted by player unlock rates.

  • It can't be worse than thisRecruit a refugee to your community.20.1%
  • I guess I have no choiceRecruit a raider to your community.12.1%
  • You've certainly proven yourselfRecruit someone from a settlement to your community.7.0%
  • By Fair Means or FowlEither purchase or steal a chicken.6.3%
  • Driving License RevokedKill 10 people or zombies by running them over with a vehicle.4.5%
  • SuperspreaderBuild up a community of 20 people or more.3.1%