Best Sci-fi Games on Steam
Steam currently has 9,388 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 5/16/2024.
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 391,913 reviews on Steam. This breaks down to a total of 386,909 positive reviews and 5,004 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 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.
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 156,432 reviews on Steam. This breaks down to a total of 154,077 positive reviews and 2,355 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 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.
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 186,336 reviews on Steam. This breaks down to a total of 182,698 positive reviews and 3,638 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 88,568 reviews on Steam. This breaks down to a total of 87,115 positive reviews and 1,453 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 21,921 reviews on Steam. This breaks down to a total of 21,716 positive reviews and 205 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $19.94 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 | $19.94 |
| Release Date | 2/14/2020 |
| Franchise | 株式会社HIKARI FIELD |
| Developer | Yuzusoft |
| Publishers | |
| Steam App Id | 1144400 |
6. 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 97, placing it in the #6 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 393,808 reviews on Steam. This breaks down to a total of 383,931 positive reviews and 9,877 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).
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 112,270 reviews on Steam. This breaks down to a total of 109,938 positive reviews and 2,332 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. 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 191,699 reviews on Steam. This breaks down to a total of 187,134 positive reviews and 4,565 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $9.99 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.
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 64,728 reviews on Steam. This breaks down to a total of 63,477 positive reviews and 1,251 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 15,583 reviews on Steam. This breaks down to a total of 15,397 positive reviews and 186 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 | ||||
|---|---|---|---|---|---|---|
 | 996 | 4/18/2011 | 98 | $9.99 | Steam Charts | |
 | 246 | 10/10/2007 | 97 | $9.99 | Steam Charts | |
 | 18,941 | 10/17/2018 | 97 | $34.99 | Steam Charts | |
 | 163 | 3/23/2020 | 97 | $59.99 | Steam Charts | |
 | 544 | 2/14/2020 | 97 | $19.94 | Steam Charts | |
 | 6,791 | 10/23/2023 | 97 | $9.99 | Steam Charts | |
 | 1,406 | 9/3/2020 | 96 | $24.99 | Steam Charts | |
 | 386 | 11/16/2004 | 96 | $9.99 | Steam Charts | |
 | 154 | 4/18/2019 | 96 | $14.99 | Steam Charts | |
 | 61 | 6/18/2020 | 96 | $20.99 | Steam Charts | |
 | 2,521 | 1/20/2021 | 96 | $19.99 | Steam Charts | |
 | 5,158 | 5/13/2020 | 96 | $29.99 | Steam Charts | |
 | 50 | 8/20/2022 | 96 | Free | Steam Charts | |
 | 193 | 7/19/2022 | 96 | $29.99 | Steam Charts | |
 | 1,576 | 1/24/2018 | 96 | $29.99 | Steam Charts | |
 | 4,066 | 6/8/2020 | 96 | $29.99 | Steam Charts | |
 | 2,906 | 6/23/2023 | 96 | $3.74 | Steam Charts | |
 | 1,202 | 5/25/2010 | 96 | $19.99 | Steam Charts | |
 | 64 | 6/21/2016 | 95 | $14.99 | Steam Charts | |
 | 6,900 | 7/30/2019 | 95 | $8.49 | 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, May 16). Steam Store. Steam Store.
- Valve Corporation. (2024, May 16). Portal 2 on Steam. Steam Store.
- Valve Corporation. (2024, March 22). Portal on Steam. Steam Store.
- Valve Corporation. (2024, May 16). RimWorld on Steam. Steam Store.
- Valve Corporation. (2024, May 16). Half-Life: Alyx on Steam. Steam Store.
- Valve Corporation. (2024, May 13). Senren＊Banka on Steam. Steam Store.
- Valve Corporation. (2024, May 16). Lethal Company on Steam. Steam Store.
- Valve Corporation. (2024, May 13). ULTRAKILL on Steam. Steam Store.
- Valve Corporation. (2024, March 22). Half-Life 2 on Steam. Steam Store.
- Valve Corporation. (2024, March 25). Katana ZERO on Steam. Steam Store.
- Valve Corporation. (2024, May 10). ATRI -My Dear Moments- on Steam. Steam Store.