Free games like Antimatter
Below are 9 free-to-play Steam games similar to Antimatter, 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 Antimatter page.
Ranked picks
- 1
The Lab
Free-to-play alternative to Antimatter — 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!
- 2
Landfall Archives
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Strategy and Indie with Antimatter.
Break into the Landfall Archives to steal and play previously unreleased games, demos, interactive slide shows, and even an unreleased version of Totally Accurate Battle Simulator from 2017!
- 3
SuchArt: Creative Space
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Indie and Simulation with Antimatter.
Paint on any surfaces with numerous tools in Creative Space — a free sandbox version of SuchArt: Genius Artist Simulator. Create masterpieces, complete commissions, and decorate your studio in the most advanced artist sim!
- 4
Aircar
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Indie with Antimatter.
A simple immersive flying game built for VR. Pilot an aircar through a futuristic cityscape.
- 5
The Riftbreaker: Prologue
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Strategy and Indie with Antimatter.
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.
- 6
SCP – Containment Breach
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Indie with Antimatter.
A procedural first-person horror adventure. You are on your own after something goes terribly wrong in this top-secret containment facility. Collect items to aid in your escape and try to uncover the truth, as horror lurks behind every door. Can you make it out alive?
- 7
Totally Accurate Battlegrounds
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Indie with Antimatter.
Grab your balloon crossbow and trusty inflatable hammer, because things are about to get wobbly! Be the last weirdo standing in the world-leading physics-based Battle Royale game.
- 8
Crusader Kings II
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Strategy and Simulation with Antimatter.
Explore one of the defining periods in world history in an experience crafted by the masters of Grand Strategy.
- 9
CivIdle
Free-to-play alternative to Antimatter — no purchase or trial window. Shares Strategy and Indie with Antimatter.
CivIdle is an idle/incremental game that allows you to lead your own civilization through thousands of years from ancient times to the modern era. Expand your territory, explore a vast tech tree, build various wonders, and trade with global players: empire must grow and numbers must go up!