Free games like Fortified Space
Below are 8 free-to-play Steam games similar to Fortified Space, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Fortified Space page.
Ranked picks
- 1
Disfigure
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Action with Fortified Space.
Disfigure is a grim-dark action rogue-like where you battle relentless hordes of monsters lurking in the shadows. Unlock powerful weapons, craft god-like builds with hundreds of upgrades, slay colossal bosses, and push your limits in intense 20–30 minute survival runs!
- 2
The Lab
Free-to-play alternative to Fortified Space — no purchase or trial window.
Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!
- 3
I MAED A GAM3 W1TH Z0MB1ES 1N IT!!!1
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Action with Fortified Space.
A top down twin stick zombie slaying shooter that you are sure to play again and again!
- 4
The Riftbreaker: Prologue
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Action and Strategy with Fortified Space.
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
- 5
The Last Sovereign
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Strategy with Fortified Space.
Explore a world torn between armies of lust and purity in which everything is more complex than it seems, deciding the fate of nations through might, politics, and finance. Every decision matters in an intricate saga that tracks thousands of variables.
- 6
Evil Egg
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Action with Fortified Space.
Blast it all to hell.
- 7
Wires And Whiskers
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Action with Fortified Space.
Wires and Whiskers is a local co-op action-puzzle game where two players control a lab-engineered gerbil and its magnetic exosuit. Work together to fight mutated enemies, solve magnetic puzzles, and survive in a ruined, post-apocalyptic trench world.
- 8
Counter-Strike 2
Free-to-play alternative to Fortified Space — no purchase or trial window. Shares Action with Fortified Space.
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.