Best Sci-fi Games on Steam

Steam currently has 11,154 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 1/3/2025.

Looking for more? Explore other lists such as:

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 banner

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 420,002 reviews on Steam. This breaks down to a total of 414,523 positive reviews and 5,479 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.

Steam Price $9.99
Release Date 4/18/2011
Franchise Valve
Developer Valve
Publisher Valve
Steam App Id 620

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 banner

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 171,628 reviews on Steam. This breaks down to a total of 168,988 positive reviews and 2,640 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.

Steam Price $9.99
Release Date 10/10/2007
Developer Valve
Publisher Valve
Steam App Id 400

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 banner

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 201,670 reviews on Steam. This breaks down to a total of 197,614 positive reviews and 4,056 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 banner

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 94,527 reviews on Steam. This breaks down to a total of 92,913 positive reviews and 1,614 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.

Steam Price $59.99
Release Date 3/23/2020
Franchise Valve
Developer Valve
Publisher Valve
Steam App Id 546560

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 banner

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 28,582 reviews on Steam. This breaks down to a total of 28,280 positive reviews and 302 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 banner

ULTRAKILL 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 143,240 reviews on Steam. This breaks down to a total of 140,165 positive reviews and 3,075 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

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 banner

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 232,012 reviews on Steam. This breaks down to a total of 226,438 positive reviews and 5,574 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.

Steam Price $9.99
Release Date 11/16/2004
Franchise Half-Life
Developer Valve
Publisher Valve
Steam App Id 220

8. Lethal Company

A co-op horror about scavenging at abandoned moons to sell scrap to the Company.

Lethal Company banner

Lethal Company 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 465,163 reviews on Steam. This breaks down to a total of 452,631 positive reviews and 12,532 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).

Steam Price $9.99
Release Date 10/23/2023
Developer Zeekerss
Publisher Zeekerss
Steam App Id 1966720

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 banner

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 69,149 reviews on Steam. This breaks down to a total of 67,789 positive reviews and 1,360 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

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 banner

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 329,776 reviews on Steam. This breaks down to a total of 320,748 positive reviews and 9,028 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.

ImageName
Actions
Portal 2 steam charts
2,162
4/18/2011
98
$9.99
Steam Charts
Portal steam charts
638
10/10/2007
97
$9.99
Steam Charts
RimWorld steam charts
22,738
10/17/2018
97
$34.99
Steam Charts
Half-Life: Alyx steam charts
562
3/23/2020
97
$59.99
Steam Charts
Senren*Banka steam charts
144
2/14/2020
97
$34.99
Steam Charts
ULTRAKILL steam charts
2,808
9/3/2020
97
$24.99
Steam Charts
Half-Life 2 steam charts
2,955
11/16/2004
96
$9.99
Steam Charts
Lethal Company steam charts
19,065
10/23/2023
96
$9.99
Steam Charts
Katana ZERO steam charts
128
4/18/2019
96
$8.99
Steam Charts
Deep Rock Galactic steam charts
7,231
5/13/2020
96
$29.99
Steam Charts
ATRI -My Dear Moments- steam charts
29
6/18/2020
96
$20.99
Steam Charts
Dyson Sphere Program steam charts
2,568
1/20/2021
96
$19.99
Steam Charts
Entropy : Zero 2 steam charts
126
8/20/2022
96
Free
Steam Charts
Stray steam charts
572
7/19/2022
96
$29.99
Steam Charts
Satisfactory steam charts
20,648
9/10/2024
96
$39.99
Steam Charts
Subnautica steam charts
4,735
1/24/2018
96
$29.99
Steam Charts
STAR WARS™ Empire at War - Gold Pack steam charts
2,500
5/25/2010
96
$19.99
Steam Charts
VA-11 Hall-A: Cyberpunk Bartender Action steam charts
103
6/21/2016
95
$14.99
Steam Charts
Oxygen Not Included steam charts
7,044
7/30/2019
95
$24.99
Steam Charts
SANABI steam charts
67
11/9/2023
95
$14.99
Steam Charts
Page 1 of 5

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, January 3). Steam Store. Steam Store.
  • Valve Corporation. (2025, January 3). Portal 2 on Steam. Steam Store.
  • Valve Corporation. (2025, January 3). Portal on Steam. Steam Store.
  • Valve Corporation. (2025, January 10). RimWorld on Steam. Steam Store.
  • Valve Corporation. (2025, January 3). Half-Life: Alyx on Steam. Steam Store.
  • Valve Corporation. (2025, January 8). Senren*Banka on Steam. Steam Store.
  • Valve Corporation. (2025, January 11). ULTRAKILL on Steam. Steam Store.
  • Valve Corporation. (2025, January 7). Half-Life 2 on Steam. Steam Store.
  • Valve Corporation. (2025, January 9). Lethal Company on Steam. Steam Store.
  • Valve Corporation. (2024, December 29). Katana ZERO on Steam. Steam Store.
  • Valve Corporation. (2025, January 7). Deep Rock Galactic on Steam. Steam Store.

Explore

Discover the best of Steam. Find your next game, free weekend, or even track the next Steam Sale all in one spot.