Best Sci-fi Games on Steam
Steam currently has 15,344 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 6/26/2026.
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 461,157 reviews on Steam. This breaks down to a total of 455,188 positive reviews and 5,969 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 195,170 reviews on Steam. This breaks down to a total of 192,290 positive reviews and 2,880 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. 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 104,158 reviews on Steam. This breaks down to a total of 102,354 positive reviews and 1,804 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 241,446 reviews on Steam. This breaks down to a total of 236,333 positive reviews and 5,113 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. 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 97, placing it in the #5 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 274,150 reviews on Steam. This breaks down to a total of 267,582 positive reviews and 6,568 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.
6. 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 96, placing it in the #6 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 36,074 reviews on Steam. This breaks down to a total of 35,543 positive reviews and 531 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $18.54 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 | $18.54 |
| Release Date | 2/14/2020 |
| Franchise | 株式会社HIKARI FIELD |
| Developer | Yuzusoft |
| Publishers | |
| Steam App Id | 1144400 |
7. 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 #7 spot for the best Sci-fi games. Its score was calculated by analyzing a total of 75,143 reviews on Steam. This breaks down to a total of 73,601 positive reviews and 1,542 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 |
8. ULTRAKILL
ULTRAKILL is a fast-paced ultra-violent retro FPS that combines the skill-based style scoring of character action games with the unadulterated carnage inspired by the best shooters of the '90s. Rip apart your foes with varied destructive weaponry and shower in their blood to regain your health.
ULTRAKILL 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 233,451 reviews on Steam. This breaks down to a total of 227,363 positive reviews and 6,088 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $22.49 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 | $22.49 |
| Release Date | 9/3/2020 |
| Franchise | New Blood Interactive |
| Developer | Arsi "Hakita" Patala |
| Publisher | New Blood Interactive |
| Steam App Id | 1229490 |
9. Satisfactory
Satisfactory is a first-person open-world factory building game with a dash of exploration and combat. Play alone or with friends, explore an alien planet, create multi-story factories, and enter conveyor belt heaven!
Satisfactory 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 273,345 reviews on Steam. This breaks down to a total of 265,842 positive reviews and 7,503 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $27.99 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 | $27.99 |
| Release Date | 9/10/2024 |
| Franchise | Coffee Stain |
| Developer | Coffee Stain Studios |
| Publisher | Coffee Stain Publishing |
| Steam App Id | 526870 |
10. Deep Rock Galactic
Deep Rock Galactic is a 1-4 player co-op FPS featuring dwarven space miners, procedurally-generated destructible environments, and endless hordes of alien monsters. Explore cave systems, mine for minerals, and work together to survive!
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 377,121 reviews on Steam. This breaks down to a total of 366,381 positive reviews and 10,740 negative reviews — making it "Overwhelmingly Positive" on Steam.
It is priced at $8.99 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 | $8.99 |
| 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 | ||||
|---|---|---|---|---|---|---|
| 1,473 | 4/18/2011 | 98 | $1.99 | Steam Charts | |
| 297 | 10/10/2007 | 97 | $1.99 | Steam Charts | |
| 273 | 3/23/2020 | 97 | $59.99 | Steam Charts | |
| 22,950 | 10/17/2018 | 97 | $34.99 | Steam Charts | |
| 1,313 | 11/16/2004 | 97 | $1.99 | Steam Charts | |
| 106 | 2/14/2020 | 96 | $18.54 | Steam Charts | |
| 98 | 4/18/2019 | 96 | $8.99 | Steam Charts | |
| 3,498 | 9/3/2020 | 96 | $22.49 | Steam Charts | |
| 20,172 | 9/10/2024 | 96 | $27.99 | Steam Charts | |
| 4,176 | 5/13/2020 | 96 | $8.99 | Steam Charts | |
 | 98 | 8/20/2022 | 96 | Free | Steam Charts | |
 | 4,353 | 1/23/2018 | 96 | $29.99 | Steam Charts | |
 | 3,350 | 10/23/2023 | 96 | $9.99 | Steam Charts | |
 | 33 | 6/18/2020 | 96 | $8.39 | Steam Charts | |
 | 235 | 7/19/2022 | 96 | $14.99 | Steam Charts | |
 | 1,710 | 1/20/2021 | 96 | $19.99 | Steam Charts | |
 | 84 | 12/6/2025 | 96 | $15.99 | Steam Charts | |
 | 1,909 | 5/25/2010 | 96 | $6.99 | Steam Charts | |
 | 2,122 | 3/6/2025 | 96 | $32.49 | Steam Charts | |
 | 114 | 4/27/2024 | 95 | Free | 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. (2026, June 26). Steam Store. Steam Store.
- Valve Corporation. (2026, June 26). Portal 2 on Steam. Steam Store.
- Valve Corporation. (2026, June 26). Portal on Steam. Steam Store.
- Valve Corporation. (2026, June 16). Half-Life: Alyx on Steam. Steam Store.
- Valve Corporation. (2026, June 20). RimWorld on Steam. Steam Store.
- Valve Corporation. (2026, June 26). Half-Life 2 on Steam. Steam Store.
- Valve Corporation. (2026, June 22). Senren＊Banka on Steam. Steam Store.
- Valve Corporation. (2026, June 16). Katana ZERO on Steam. Steam Store.
- Valve Corporation. (2026, June 25). ULTRAKILL on Steam. Steam Store.
- Valve Corporation. (2026, June 25). Satisfactory on Steam. Steam Store.
- Valve Corporation. (2026, June 24). Deep Rock Galactic on Steam. Steam Store.