Free to Play Sci-fi Games on Steam
Check out this fantastic list of free-to-play sci-fi games you can enjoy on Steam right now, updated on September 15th 2025. Looking for even more free titles? Explore the complete list of the best free to play sci-fi games.
Lists & Categories
1. Star Trek Online
In Star Trek Online, the Star Trek universe appears for the first time on a truly massive scale. Players take the captain's chair as they command their own starship and crew. Explore strange new worlds, seek out new life and new civilizations, and boldly go where no one has gone before. Star Trek Online is a game developed and published by . Released on January 31st 2012 has received 20,145 reviews of which 15,939 were positive and 4,206 were negative resulting in a rating of 7.8 out of 10. The game has hit the top spot as the #1 most played sci-fi game, thanks to its 1,200 peak concurrent players over the last day.
7.8
15,939
4,206
1,200
players
2. Hades' Star
A unique space strategy game where thousands of players participate in one shared galaxy. Hades' Star is a game developed and published by . Released on February 27th 2019 has received 2,577 reviews of which 1,874 were positive and 703 were negative resulting in a rating of 7.1 out of 10. While seeing 123 players online at once in the last 24 hours, this game is currently ranked #2 among sci-fi games based on player count.
7.1
1,874
703
123
players
3. Pixel Starships
Pixel Starships is an FTL-style online sci-fi strategy builder and management game with a competitive PVP tournament. Set in the retro galaxy, your role is to explore space, meet aliens, and develop your ship, crew and AI. The game contains deep strategic and 4x elements. PSS is community-driven. Pixel Starships is a game developed and published by . Released on May 23rd 2023 has received 2,732 reviews of which 2,008 were positive and 724 were negative resulting in a rating of 7.1 out of 10. While seeing 105 players online at once in the last 24 hours, this game is currently ranked #3 among sci-fi games based on player count.
7.1
2,008
724
105
players
4. Endless Sky
Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters. Endless Sky is a game developed and published by . Released on October 30th 2015 has received 6,651 reviews of which 6,141 were positive and 510 were negative resulting in a rating of 8.9 out of 10. With 102 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played sci-fi games.
8.9
6,141
510
102
players
5. Prosperous Universe
In Prosperous Universe start your galactic empire by trading on the real-time market exchange with other real players. Build your 1st base from humble beginnings & watch as your business flourishes with complex supply chain strategies. Economics, politics & realism fuel this immersive business MMO. Prosperous Universe is a game developed and published by . Released on April 20th 2022 has received 922 reviews of which 693 were positive and 229 were negative resulting in a rating of 7.2 out of 10. The game currently holds the #5 spot among the most played sci-fi games.
7.2
693
229
14
players
6. Buy a Croquette!
March 2012, Nagano. The brave and clever high school girl, Chio Aozora, is facing a major crisis: she doesn’t have enough money to buy a croquette! Navigate through the streets and alleys of Nagano, interact with a variety of characters, solve complex puzzles, collect 380 yen, and buy a croquette! Buy a Croquette! is a game developed and published by . Released on April 27th 2024 has received 4,397 reviews of which 4,355 were positive and 42 were negative resulting in an impressive rating of 9.5 out of 10. The game currently holds the #6 spot among the most played sci-fi games.
9.5
4,355
42
11
players
7. Toaster Arena
Toaster Arena is a first person multiplayer arena shooter where players battle it out on different maps and game modes. Use Advanced movement to traverse obstacles and gain the advantage on the battlefield. Toaster Arena is a game developed and published by . Released on January 20th 2025 has received 447 reviews of which 408 were positive and 39 were negative resulting in a rating of 8.5 out of 10. The game currently holds the #7 spot among the most played sci-fi games.
8.5
408
39
6
players
8. South Scrimshaw, Part One
South Scrimshaw is the story of a newborn whale in a vast alien ocean. It is a richly illustrated experimental visual novel, written in the style of a nature documentary. South Scrimshaw, Part One is a game developed and published by . Released on June 09th 2023 has received 1,442 reviews of which 1,429 were positive and 13 were negative resulting in an impressive rating of 9.4 out of 10. The game currently holds the #8 spot among the most played sci-fi games.
9.4
1,429
13
1
players
9. The Orville - Interactive Fan Experience
Step aboard the USS Orville (ECV-197), the Planetary Union's finest mid-level exploratory class cruiser. With every room on every deck recreated with painstaking accuracy, you are free to explore the ship at your leisure and engage in all manner of shenanigans! The Orville - Interactive Fan Experience is a game developed and published by . Released on July 23rd 2019 has received 998 reviews of which 901 were positive and 97 were negative resulting in a rating of 8.5 out of 10. The game currently holds the #9 spot among the most played sci-fi games.
8.5
901
97
1
players
10. Star Wars: Droid Repair Bay
In Star Wars: Droid Repair Bay by ILMxLAB, Poe Dameron's sidekick needs your help. Repair BB-8 and his astromech droid friends, each with their own unique personalities, so they can roll back into the fight against the First Order. Star Wars: Droid Repair Bay is a game developed and published by . Released on December 06th 2017 has received 539 reviews of which 484 were positive and 55 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #10 spot among the most played sci-fi games.
8.4
484
55
1
players
More Sci-fi & Related Games
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