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Fossilfuel

Also known as Fossilfuel, f, fossilfuel

Fossilfuel, is a horror action shooter, where the player must fight their way through Jurassic monsters and Super Soldiers, in this multi-ending, adrenaline-fueled cyberpunk experience!

Last update
16 Jun 2026
Players now
0

Latest update

Announcement

Fossilfuel 3 Demo Available Now!

Nearly five years ago, Fossilfuel launched on Steam and began a journey that would eventually lead to Fossilfuel 2 and now Fossilfuel 3. As Fossilfuel approaches its fifth anniversary, the original game is now $14.99. W…

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Update history

Browse past updates and patch notes for this game.

21 updates

Gallery

In-game media

Achievements

Community progression

Top picks from 28 Steam achievements, sorted by player unlock rates.

  • Welcome to SierraStart your day at the Sierra Research Institute.93.3%
  • First EncounterMeet Utahraptor.89.1%
  • Build your headlampLand of the blind no more!68.6%
  • Walk around moneyHidden44.8%
  • Long GrassHidden23.9%
  • Get to administrationYou have escaped the lower sub-level of Sierra.18.4%