Best Sci-fi Games on Steam
Steam currently has 9,924 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 7/24/2024.
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 401,089 reviews on Steam. This breaks down to a total of 395,876 positive reviews and 5,213 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 161,849 reviews on Steam. This breaks down to a total of 159,372 positive reviews and 2,477 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. 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 190,668 reviews on Steam. This breaks down to a total of 186,858 positive reviews and 3,810 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $27.99 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 | $27.99 |
| 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 89,910 reviews on Steam. This breaks down to a total of 88,403 positive reviews and 1,507 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 24,147 reviews on Steam. This breaks down to a total of 23,918 positive reviews and 229 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 120,702 reviews on Steam. This breaks down to a total of 118,157 positive reviews and 2,545 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. 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 #7 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 416,049 reviews on Steam. This breaks down to a total of 405,182 positive reviews and 10,867 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).
8. 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 worldwide.
Half-Life 2 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 196,686 reviews on Steam. This breaks down to a total of 191,941 positive reviews and 4,745 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.
9. 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 #9 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 66,334 reviews on Steam. This breaks down to a total of 65,056 positive reviews and 1,278 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 |
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 17,393 reviews on Steam. This breaks down to a total of 17,176 positive reviews and 217 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 | ||||
|---|---|---|---|---|---|---|
 | 1,793 | 4/18/2011 | 98 | $9.99 | Steam Charts | |
 | 514 | 10/10/2007 | 97 | $9.99 | Steam Charts | |
 | 20,927 | 10/17/2018 | 97 | $27.99 | Steam Charts | |
 | 346 | 3/23/2020 | 97 | $59.99 | Steam Charts | |
 | 222 | 2/14/2020 | 97 | $34.99 | Steam Charts | |
 | 2,011 | 9/3/2020 | 96 | $24.99 | Steam Charts | |
 | 12,668 | 10/23/2023 | 96 | $9.99 | Steam Charts | |
 | 746 | 11/16/2004 | 96 | $9.99 | Steam Charts | |
 | 217 | 4/18/2019 | 96 | $14.99 | Steam Charts | |
 | 85 | 6/18/2020 | 96 | $20.99 | Steam Charts | |
 | 8,596 | 5/13/2020 | 96 | $29.99 | Steam Charts | |
 | 2,535 | 1/21/2021 | 96 | $17.99 | Steam Charts | |
 | 94 | 8/20/2022 | 96 | Free | Steam Charts | |
 | 381 | 7/19/2022 | 96 | $29.99 | Steam Charts | |
 | 4,254 | 1/23/2018 | 96 | $14.99 | Steam Charts | |
 | 8,905 | 6/8/2020 | 96 | $29.99 | Steam Charts | |
 | 2,276 | 6/23/2023 | 96 | $3.74 | Steam Charts | |
 | 1,710 | 5/25/2010 | 96 | $19.99 | Steam Charts | |
 | 52 | 6/21/2016 | 95 | $14.99 | Steam Charts | |
 | 8,294 | 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. (2024, July 24). Steam Store. Steam Store.
- Valve Corporation. (2024, July 24). Portal 2 on Steam. Steam Store.
- Valve Corporation. (2024, July 26). Portal on Steam. Steam Store.
- Valve Corporation. (2024, July 18). RimWorld on Steam. Steam Store.
- Valve Corporation. (2024, July 24). Half-Life: Alyx on Steam. Steam Store.
- Valve Corporation. (2024, July 12). Senren＊Banka on Steam. Steam Store.
- Valve Corporation. (2024, July 24). ULTRAKILL on Steam. Steam Store.
- Valve Corporation. (2024, July 26). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2024, July 26). Half-Life 2 on Steam. Steam Store.
- Valve Corporation. (2024, July 15). Katana ZERO on Steam. Steam Store.
- Valve Corporation. (2024, July 25). ATRI -My Dear Moments- on Steam. Steam Store.