Free Sci-fi Games on Steam
Steam currently has 11,372 Sci-fi games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Sci-fi game rankings were last updated on 2/13/2025.
Looking for more? Explore other lists such as:
- Best sci-fi games on Steam
- Best sci-fi Steam Deck games
- Best sci-fi Steam games for Mac OS
- Best sci-fi Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Marvel Rivals
Marvel Rivals is a Super Hero Team-Based PVP Shooter! Assemble an all-star Marvel squad, devise countless strategies by combining powers to form unique Team-Up skills and fight in destructible, ever-changing battlefields across the continually evolving Marvel universe!
Marvel Rivals holds the #1 spot for "best free Sci-fi game on Steam" with a Player Score of 80. Its score was calculated by analyzing a total of 209,454 reviews on Steam. This breaks down to a total of 170,031 positive reviews and 39,423 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Marvel Rivals on the Steam Deck (though some functionality may be limited).
| Release Date | 12/6/2024 |
| Developer | NetEase Games |
| Publisher | NetEase Games |
| Steam App Id | 2767030 |
2. Apex Legends™
Apex Legends is the award-winning, free-to-play Hero Shooter from Respawn Entertainment. Master an ever-growing roster of legendary characters with powerful abilities, and experience strategic squad play and innovative gameplay in the next evolution of Hero Shooter and Battle Royale.
Apex Legends™ has achieved a Player Score of 67, placing it in the #2 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 978,803 reviews on Steam. This breaks down to a total of 658,221 positive reviews and 320,582 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Apex Legends™ on the Steam Deck.
| Release Date | 11/5/2020 |
| Franchise | Apex Legends Official |
| Developers | |
| Publisher | Electronic Arts |
| Steam App Id | 1172470 |
3. Warframe
Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game
Warframe has achieved a Player Score of 87, placing it in the #3 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 607,994 reviews on Steam. This breaks down to a total of 531,676 positive reviews and 76,318 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 3/25/2013 |
| Developer | Digital Extremes |
| Publisher | Digital Extremes |
| Steam App Id | 230410 |
4. Limbus Company
As the Executive Manager of Limbus Company, lead your group of twelve Sinners, venture into the buried facilities of Lobotomy Corporation, and lay claim on the Golden Boughs.
Limbus Company has achieved a Player Score of 83, placing it in the #4 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 49,905 reviews on Steam. This breaks down to a total of 42,228 positive reviews and 7,677 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Limbus Company on the Steam Deck (though some functionality may be limited).
| Release Date | 2/26/2023 |
| Developer | ProjectMoon |
| Publisher | ProjectMoon |
| Steam App Id | 1973530 |
5. Crab Game
Crab Game is a First-Person Multiplayer game where you play through several different minigames based on children's games, until only one player stands victorious.
Crab Game has achieved a Player Score of 90, placing it in the #5 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 152,475 reviews on Steam. This breaks down to a total of 139,690 positive reviews and 12,785 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Crab Game on the Steam Deck (though some functionality may be limited).
6. Destiny 2
Destiny 2 is an action MMO with a single evolving world that you and your friends can join anytime, anywhere, absolutely free.
Destiny 2 has achieved a Player Score of 79, placing it in the #6 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 619,116 reviews on Steam. This breaks down to a total of 493,748 positive reviews and 125,368 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Destiny 2 on the Steam Deck.
7. Overwatch® 2
Overwatch 2 is a critically acclaimed, team-based shooter game set in an optimistic future with an evolving roster of heroes. Team up with friends and jump in today.
Overwatch® 2 has achieved a Player Score of 23, placing it in the #7 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 327,408 reviews on Steam. This breaks down to a total of 72,450 positive reviews and 254,958 negative reviews — making it "Mostly Negative" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Overwatch® 2 on the Steam Deck (though some functionality may be limited).
| Release Date | 8/10/2023 |
| Franchise | Blizzard |
| Developer | Blizzard Entertainment, Inc. |
| Publisher | Blizzard Entertainment, Inc. |
| Steam App Id | 2357570 |
8. OBS Studio
Free and open-source software for video recording and live streaming
OBS Studio has achieved a Player Score of 93, placing it in the #8 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 32,303 reviews on Steam. This breaks down to a total of 30,782 positive reviews and 1,521 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is not possible to play or run OBS Studio on the Steam Deck.
| Release Date | 3/21/2022 |
| Developer | OBS Project |
| Publisher | OBS Project |
| Steam App Id | 1905180 |
9. The First Descendant
The First Descendant is a third-person looter shooter powered by Unreal Engine 5. Become a Descendant. Fight for the survival of humanity. Descendants have unique abilities to tackle both solo and co-op missions. Up to 4 players use varied mechanics to defeat giant bosses. BE THE FIRST DESCENDANT!
The First Descendant has achieved a Player Score of 57, placing it in the #9 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 98,365 reviews on Steam. This breaks down to a total of 56,238 positive reviews and 42,127 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run The First Descendant on the Steam Deck.
| Release Date | 6/30/2024 |
| Developer | NEXON Games Co., Ltd. |
| Publisher | NEXON |
| Steam App Id | 2074920 |
10. Unnamed Space Idle
Destroy endless waves of alien ships that have all but wiped out humanity in this long form, unfolding, sci-fi idle game. Customize your ship with different weapons and defenses to defeat specific enemy types and utilize a ton of different systems to increase your overall power.
Unnamed Space Idle has achieved a Player Score of 89, placing it in the #10 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 2,404 reviews on Steam. This breaks down to a total of 2,239 positive reviews and 165 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Unnamed Space Idle on the Steam Deck (though some functionality may be limited).
| Release Date | 7/27/2023 |
| Developer | Sylv |
| Publishers | |
| Steam App Id | 2471100 |
More Free Sci-fi Games
Explore even more rankings for the 100 best free Sci-fi games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 107,734 | 12/6/2024 | 80 | Free | Steam Charts | |
| 100,807 | 11/5/2020 | 67 | Free | Steam Charts | |
| 45,890 | 3/25/2013 | 87 | Free | Steam Charts | |
| 26,073 | 2/26/2023 | 83 | Free | Steam Charts | |
| 25,973 | 10/29/2021 | 90 | Free | Steam Charts | |
| 24,791 | 10/1/2019 | 79 | Free | Steam Charts | |
| 16,500 | 8/10/2023 | 23 | Free | Steam Charts | |
| 13,656 | 3/21/2022 | 93 | Free | Steam Charts | |
| 8,503 | 6/30/2024 | 57 | Free | Steam Charts | |
| 4,920 | 7/27/2023 | 89 | Free | Steam Charts | |
 | 4,025 | 11/21/2024 | 75 | Free | Steam Charts | |
 | 3,951 | 12/29/2017 | 90 | Free | Steam Charts | |
 | 3,573 | 8/10/2022 | 84 | Free | Steam Charts | |
 | 3,437 | 11/3/2021 | 88 | Free | Steam Charts | |
 | 2,528 | 12/16/2010 | 73 | Free | Steam Charts | |
 | 2,254 | 7/21/2020 | 88 | Free | Steam Charts | |
 | 1,549 | 4/4/2018 | 60 | Free | Steam Charts | |
 | 1,542 | 12/25/2023 | 76 | Free | Steam Charts | |
 | 1,405 | 2/10/2025 | 86 | Free | Steam Charts | |
 | 1,394 | 7/18/2024 | 73 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2025, February 13). Steam Store. Steam Store.
- Valve Corporation. (2025, February 13). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2025, February 13). Apex Legends™ on Steam. Steam Store.
- Valve Corporation. (2025, February 5). Warframe on Steam. Steam Store.
- Valve Corporation. (2025, February 13). Limbus Company on Steam. Steam Store.
- Valve Corporation. (2025, February 5). Crab Game on Steam. Steam Store.
- Valve Corporation. (2025, February 12). Destiny 2 on Steam. Steam Store.
- Valve Corporation. (2025, February 10). Overwatch® 2 on Steam. Steam Store.
- Valve Corporation. (2025, February 12). OBS Studio on Steam. Steam Store.
- Valve Corporation. (2025, February 13). The First Descendant on Steam. Steam Store.
- Valve Corporation. (2025, February 11). Unnamed Space Idle on Steam. Steam Store.