Best Sci-fi Games on Steam
Steam currently has 10,627 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 10/18/2024.
Looking for more? Explore other lists such as:
- Free sci-fi games on Steam
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- Free Steam games
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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 410,005 reviews on Steam. This breaks down to a total of 404,632 positive reviews and 5,373 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.
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 166,664 reviews on Steam. This breaks down to a total of 164,106 positive reviews and 2,558 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.
3. 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 #3 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 92,029 reviews on Steam. This breaks down to a total of 90,478 positive reviews and 1,551 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.
4. 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 #4 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 195,859 reviews on Steam. This breaks down to a total of 191,907 positive reviews and 3,952 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 |
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 26,876 reviews on Steam. This breaks down to a total of 26,604 positive reviews and 272 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. 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 #6 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 131,614 reviews on Steam. This breaks down to a total of 128,791 positive reviews and 2,823 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 |
7. Half-Life 2
1998. HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling. Valve's debut title wins more than 50 game-of-the-year awards on its way to being named "Best PC Game Ever" by PC Gamer, and launches a franchise with more than eight million retail units sold...
Half-Life 2 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 201,339 reviews on Steam. This breaks down to a total of 196,482 positive reviews and 4,857 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.
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 68,036 reviews on Steam. This breaks down to a total of 66,698 positive reviews and 1,338 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $8.99 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 | $8.99 |
| 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 441,531 reviews on Steam. This breaks down to a total of 429,550 positive reviews and 11,981 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $6.99 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. ATRI -My Dear Moments-
"As the world sank, I found you." In the near future, a sudden and unexplained sea rise has left much of human civilization underwater. In a little town slowly being enveloped by the ocean, an unforgettable summer is about to begin for a boy and a mysterious robot girl...
ATRI -My Dear Moments- 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 19,402 reviews on Steam. This breaks down to a total of 19,137 positive reviews and 265 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $20.99 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 | $20.99 |
| Release Date | 6/18/2020 |
| Franchise | ANIPLEX.EXE |
| Developers | |
| Publishers | |
| Steam App Id | 1230140 |
More Sci-fi Games
Explore even more rankings for the 100 best Sci-fi games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 2,901 | 4/18/2011 | 98 | $9.99 | Steam Charts | |
| 732 | 10/10/2007 | 97 | $9.99 | Steam Charts | |
| 431 | 3/23/2020 | 97 | $59.99 | Steam Charts | |
| 25,859 | 10/17/2018 | 97 | $34.99 | Steam Charts | |
| 498 | 2/14/2020 | 97 | $34.99 | Steam Charts | |
| 2,711 | 9/3/2020 | 96 | $24.99 | Steam Charts | |
| 1,081 | 11/16/2004 | 96 | $9.99 | Steam Charts | |
| 227 | 4/18/2019 | 96 | $8.99 | Steam Charts | |
| 25,247 | 10/23/2023 | 96 | $6.99 | Steam Charts | |
| 94 | 6/18/2020 | 96 | $20.99 | Steam Charts | |
 | 14,997 | 5/13/2020 | 96 | $9.89 | Steam Charts | |
 | 3,044 | 1/21/2021 | 96 | $19.99 | Steam Charts | |
 | 127 | 8/20/2022 | 96 | Free | Steam Charts | |
 | 1,115 | 7/19/2022 | 96 | $17.99 | Steam Charts | |
 | 8,926 | 1/24/2018 | 96 | $14.99 | Steam Charts | |
 | 2,433 | 5/26/2010 | 96 | $19.99 | Steam Charts | |
 | 59,819 | 9/10/2024 | 96 | $39.99 | Steam Charts | |
 | 68 | 6/21/2016 | 95 | $14.99 | Steam Charts | |
 | 6,732 | 7/30/2019 | 95 | $24.99 | Steam Charts | |
 | 22,905 | 6/23/2023 | 95 | $2.99 | 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. (2024, October 18). Steam Store. Steam Store.
- Valve Corporation. (2024, October 18). Portal 2 on Steam. Steam Store.
- Valve Corporation. (2024, October 18). Portal on Steam. Steam Store.
- Valve Corporation. (2024, October 16). Half-Life: Alyx on Steam. Steam Store.
- Valve Corporation. (2024, October 30). RimWorld on Steam. Steam Store.
- Valve Corporation. (2024, October 29). Senren＊Banka on Steam. Steam Store.
- Valve Corporation. (2024, October 29). ULTRAKILL on Steam. Steam Store.
- Valve Corporation. (2024, November 1). Half-Life 2 on Steam. Steam Store.
- Valve Corporation. (2024, November 2). Katana ZERO on Steam. Steam Store.
- Valve Corporation. (2024, November 2). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2024, October 23). ATRI -My Dear Moments- on Steam. Steam Store.