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Check out this fantastic list of free-to-play space sim games you can enjoy on Steam right now, updated on September 08th 2026. Looking for even more free titles? Explore the complete list of the best free to play space sim games on Steam.
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1. Star Conflict
Star Conflict is an action-packed, massively multiplayer space simulation game that puts players in the role of elite pilots engaging in a widespread interplanetary skirmish. The whole world for PVP and PVE! Star Conflict is a online co-op, space sim and open world game. Released on February 27th 2013 has received 14,853 reviews of which 10,879 were positive and 3,974 were negative resulting in a rating of 7.2 out of 10. The game currently holds the #1 spot among the most played space sim games.
7.2
10,879
3,974
30
players
2. Sputnika Game
A Cosmic twist on a Suika-style game with space gravity. Help our little friend Sputnik on his journey to become the Sun. Sputnika Game is a casual, strategy and puzzle game. Released on February 11th 2024 has received 657 reviews of which 588 were positive and 69 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #2 spot among the most played space sim games.
8.4
588
69
7
players
3. Space Commander: War and Trade
Fight, explore the stars, trade, and lead your fleet across the galaxySpace Commander: War and Trade is an ultimate single player space-sim featuring spectacular graphics, intuitive combat and deep mechanics. Space Commander: War and Trade is a action, rpg and base-building game. Released on November 04th 2020 has received 656 reviews of which 442 were positive and 214 were negative resulting in a rating of 6.5 out of 10. The game currently holds the #3 spot among the most played space sim games.
6.5
442
214
5
players
4. Microbial Sector
It's your first day as a lifeform researcher, and while you don’t know much about the job, you're desperate for the paycheck. What could possibly go wrong? Microbial Sector is a action-adventure, space sim and puzzle platformer game. Released on October 09th 2024 has received 309 reviews of which 299 were positive and 10 were negative resulting in a rating of 8.8 out of 10. The game currently holds the #4 spot among the most played space sim games.
8.8
299
10
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