Best Sci-fi Games on Steam
Steam currently has 12,195 Sci-fi games available to download and play. Explore our list of the best picks ranked by Player Score. Our Player Score rankings are calculated directly from reviews left on the Steam store and will be updated in real-time as more players leave their feedback. Sci-fi game rankings were last updated on 5/30/2025.
Looking for more? Explore other lists such as:
- Free sci-fi games on Steam
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- Best sci-fi Steam games for Mac OS
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Portal 2
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
Portal 2 holds the #1 spot for "best Sci-fi game on Steam" with a Player Score of 98. Its score was calculated by analyzing a total of 433,259 reviews on Steam. This breaks down to a total of 427,590 positive reviews and 5,669 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $1.99 to play and can be played and ran on both Windows and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
2. Portal
Portal™ is a new single player game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative new games on the horizon and will offer gamers hours of unique gameplay.
Portal has achieved a Player Score of 97, placing it in the #2 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 177,630 reviews on Steam. This breaks down to a total of 174,914 positive reviews and 2,716 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $1.99 to play and can be played and ran on both Windows and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
3. RimWorld
A sci-fi colony sim driven by an intelligent AI storyteller. Generates stories by simulating psychology, ecology, gunplay, melee combat, climate, biomes, diplomacy, interpersonal relationships, art, medicine, trade, and more.
RimWorld has achieved a Player Score of 97, placing it in the #3 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 210,411 reviews on Steam. This breaks down to a total of 206,113 positive reviews and 4,298 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $34.99 to play and can be played and ran on Windows, Mac, and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $34.99 |
| Release Date | 10/17/2018 |
| Developer | Ludeon Studios |
| Publisher | Ludeon Studios |
| Steam App Id | 294100 |
4. Half-Life: Alyx
Half-Life: Alyx is Valve’s VR return to the Half-Life series. It’s the story of an impossible fight against a vicious alien race known as the Combine, set between the events of Half-Life and Half-Life 2. Playing as Alyx Vance, you are humanity’s only chance for survival.
Half-Life: Alyx has achieved a Player Score of 97, placing it in the #4 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 97,217 reviews on Steam. This breaks down to a total of 95,542 positive reviews and 1,675 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $59.99 to play and can be played and ran on Windows systems. At the moment, it is not possible to play or run Half-Life: Alyx on the Steam Deck.
5. Senren＊Banka
Senren＊Banka is a Japanese-style visual novel produced by Yuzusoft, a Japanese developer of romance VNs. This game commemorated Yuzusoft's 10th anniversary. It won numerous awards on the year of its release in Japan for its art, music, and characters.
Senren＊Banka has achieved a Player Score of 97, placing it in the #5 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 31,210 reviews on Steam. This breaks down to a total of 30,853 positive reviews and 357 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $34.99 to play and can be played and ran on Windows systems. At the moment, it is not possible to play or run Senren＊Banka on the Steam Deck.
| Steam Price | $34.99 |
| Release Date | 2/14/2020 |
| Franchise | 株式会社HIKARI FIELD |
| Developer | Yuzusoft |
| Publishers | |
| Steam App Id | 1144400 |
6. Half-Life 2
Reawakened from stasis in the occupied metropolis of City 17, Gordon Freeman is joined by Alyx Vance as he leads a desperate human resistance. Experience the landmark first-person shooter packed with immersive world-building, boundary-pushing physics, and exhilarating combat.
Half-Life 2 has achieved a Player Score of 96, placing it in the #6 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 245,478 reviews on Steam. This breaks down to a total of 239,574 positive reviews and 5,904 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 to play and can be played and ran on both Windows and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
7. ULTRAKILL
ULTRAKILL is a fast-paced ultraviolent retro FPS combining the skill-based style scoring from character action games with unadulterated carnage inspired by the best shooters of the '90s. Rip apart your foes with varied destructive weapons and shower in their blood to regain your health.
ULTRAKILL has achieved a Player Score of 96, placing it in the #7 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 169,741 reviews on Steam. This breaks down to a total of 165,857 positive reviews and 3,884 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $24.99 to play and can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $24.99 |
| Release Date | 9/3/2020 |
| Franchise | New Blood Interactive |
| Developer | Arsi "Hakita" Patala |
| Publisher | New Blood Interactive |
| Steam App Id | 1229490 |
8. Katana ZERO
Katana ZERO is a stylish neo-noir, action-platformer featuring breakneck action and instant-death combat. Slash, dash, and manipulate time to unravel your past in a beautifully brutal acrobatic display.
Katana ZERO has achieved a Player Score of 96, placing it in the #8 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 71,051 reviews on Steam. This breaks down to a total of 69,656 positive reviews and 1,395 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $14.99 to play and can be played and ran on both Windows and Mac systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Steam Price | $14.99 |
| Release Date | 4/18/2019 |
| Developer | Askiisoft |
| Publisher | Devolver Digital |
| Steam App Id | 460950 |
9. Lethal Company
A co-op horror about scavenging at abandoned moons to sell scrap to the Company.
Lethal Company has achieved a Player Score of 96, placing it in the #9 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 487,461 reviews on Steam. This breaks down to a total of 473,712 positive reviews and 13,749 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 to play and can be played and ran on Windows systems. At the moment, it is possible to play Lethal Company on the Steam Deck (though some functionality may be limited).
10. Deep Rock Galactic
Deep Rock Galactic is a 1-4 player co-op FPS featuring badass space Dwarves, 100% destructible environments, procedurally-generated caves, and endless hordes of alien monsters.
Deep Rock Galactic has achieved a Player Score of 96, placing it in the #10 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 343,081 reviews on Steam. This breaks down to a total of 333,662 positive reviews and 9,419 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $29.99 to play and can be played and ran on Windows systems. At the moment, it is possible to play Deep Rock Galactic on the Steam Deck (though some functionality may be limited).
| Steam Price | $29.99 |
| Release Date | 5/13/2020 |
| Franchise | Coffee Stain |
| Developer | Ghost Ship Games |
| Publisher | Coffee Stain Publishing |
| Steam App Id | 548430 |
More Sci-fi Games
Explore even more rankings for the 100 best Sci-fi games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 2,052 | 4/18/2011 | 98 | $1.99 | Steam Charts | |
| 625 | 10/10/2007 | 97 | $1.99 | Steam Charts | |
| 18,957 | 10/17/2018 | 97 | $34.99 | Steam Charts | |
| 127 | 3/23/2020 | 97 | $59.99 | Steam Charts | |
| 374 | 2/14/2020 | 97 | $34.99 | Steam Charts | |
| 1,487 | 11/16/2004 | 96 | $9.99 | Steam Charts | |
| 1,644 | 9/3/2020 | 96 | $24.99 | Steam Charts | |
| 69 | 4/18/2019 | 96 | $14.99 | Steam Charts | |
| 2,838 | 10/23/2023 | 96 | $9.99 | Steam Charts | |
| 4,531 | 5/13/2020 | 96 | $29.99 | Steam Charts | |
 | 47 | 6/18/2020 | 96 | $20.99 | Steam Charts | |
 | 63 | 8/20/2022 | 96 | Free | Steam Charts | |
 | 2,708 | 1/20/2021 | 96 | $19.99 | Steam Charts | |
 | 8,631 | 9/10/2024 | 96 | $39.99 | Steam Charts | |
 | 2,064 | 1/24/2018 | 96 | $29.99 | Steam Charts | |
 | 386 | 7/19/2022 | 96 | $17.99 | Steam Charts | |
 | 4,608 | 3/6/2025 | 96 | $49.99 | Steam Charts | |
 | 1,619 | 5/26/2010 | 96 | $19.99 | Steam Charts | |
 | 38 | 6/21/2016 | 95 | $14.99 | Steam Charts | |
 | 7,114 | 7/30/2019 | 95 | $24.99 | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Reviews 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, May 30). Steam Store. Steam Store.
- Valve Corporation. (2025, May 30). Portal 2 on Steam. Steam Store.
- Valve Corporation. (2025, May 30). Portal on Steam. Steam Store.
- Valve Corporation. (2025, June 4). RimWorld on Steam. Steam Store.
- Valve Corporation. (2025, May 21). Half-Life: Alyx on Steam. Steam Store.
- Valve Corporation. (2025, May 22). Senren＊Banka on Steam. Steam Store.
- Valve Corporation. (2025, June 4). Half-Life 2 on Steam. Steam Store.
- Valve Corporation. (2025, May 27). ULTRAKILL on Steam. Steam Store.
- Valve Corporation. (2025, May 26). Katana ZERO on Steam. Steam Store.
- Valve Corporation. (2025, June 5). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2025, June 4). Deep Rock Galactic on Steam. Steam Store.