Free games like ZERO Sievert 2
Below are 9 free-to-play Steam games similar to ZERO Sievert 2, 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 ZERO Sievert 2 page.
Ranked picks
- 1
Ultimate Custom Night
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action and Indie with ZERO Sievert 2.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
- 2
Indigo Park: Chapter 1
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action and Indie with ZERO Sievert 2.
Explore the abandoned childhood wonder of Indigo Park! Guided by Rambley the Raccoon, help restore power to the destroyed amusement park while you run from the reason it shut down.
- 3
Counter-Strike:Global Offensive
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action with ZERO Sievert 2.
Counter-Strike:Global Offensive (CS:GO) expands upon the team-based action gameplay that it pioneered when it was launched over 2 decades ago. CS:GO features new maps, characters, weapons, and game modes, and delivers updated versions of the classic CS content (de_dust2, etc.).
- 4
Disfigure
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action and Indie with ZERO Sievert 2.
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!
- 5
The Lab
Free-to-play alternative to ZERO Sievert 2 — 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!
- 6
93, Kuindzhi
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Indie and Adventure with ZERO Sievert 2.
Kuindzhi, 93 is an atmospheric first-person narrative vignette about an 18-year-old boy from Donbas. The story takes us to March 2022, when the world changed forever — into a space where the past, fears, and doubts find their voice.
- 7
I MAED A GAM3 W1TH Z0MB1ES 1N IT!!!1
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action and Indie with ZERO Sievert 2.
A top down twin stick zombie slaying shooter that you are sure to play again and again!
- 8
The Riftbreaker: Prologue
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action and Indie with ZERO Sievert 2.
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.
- 9
Dinogen Online
Free-to-play alternative to ZERO Sievert 2 — no purchase or trial window. Shares Action and Indie with ZERO Sievert 2.
Action-packed 2D multiplayer top-down shooter. Play as a human or dinosaur with hundreds of weapons, game modes, and maps!