Best Sci-fi Games on Steam
Unlike generic lists, our game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated sci-fi games.
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Galaxy on Fire 2™ Full HD
A hyperdrive malfunction sends Keith T. Maxwell tumbling through space and time to fight for his life against a mysterious alien armada that is wreaking havoc.
Iron Brigade
Join The Mobile Trench Brigade and protect humanity from the evil Monovision menace!
Awesomenauts
Use your power, show your might! Play this Multiplayer Online Battle Arena (MOBA) game! AWESOMENAUTS combines 2D platforming with team-based strategy and hero based action. Whether you are a new recruit or an intergalactic legend, play AWESOMENAUTS!
Prototype 2
Become the ultimate shape-shifting weapon!
Resonance
When a brilliant particle physicist dies unexpectedly, the race is on to secure his terrible new technology before it falls into the wrong hands. The lives of four playable characters become entangled as they fight against the clock to find the dead scientist’s secret vault.
Hard Reset Extended Edition
Over-the-top destruction, loads of enemies & a beautifully realized cyberpunk setting. Hard Reset is here to shake up the shooter scene. Try the demo now.
ENDLESS™ Space - Definitive Edition
ENDLESS™ Space is a turn-based 4X strategy game, covering the space colonization age in the ENDLESS™ Universe, where you can control every aspect of your civilization as you strive for galactic domination.
Tribes: Ascend
This edition packages weapon DLC from ten previous expansions as well new featured content.
Quantum Conundrum
Find and rescue your uncle by using his newest invention to work your way through a crazy complex mansion as you switch between dimensions and solve puzzles!
Sins of a Solar Empire®: Rebellion
Command a space-faring empire in Sins of a Solar Empire: Rebellion, the new stand-alone expansion that combines 4X depth with real-time strategy gameplay.
The Dream Machine: Chapter 1 & 2
The Dream Machine is an award-winning point & click adventure game about exploring other people's dreams. It's built by hand using materials such as clay, cardboard and broccoli.
Aliens: Colonial Marines Collection
You & your friends are the deadliest killers in the galaxy – the US Colonial Marines. It’s up to you to not just survive, but wipe out the Xeno infestation.
Analogue: A Hate Story
A dark visual mystery novel featuring transhumanism, traditional marriage, loneliness, and cosplay. Two pursuable characters. Five endings. Welcome to the future.
Binary Domain
Set in futuristic Tokyo, take control of the robotic community before they control everything!
Insanely Twisted Shadow Planet
In this Insanely Twisted, 2-D action-adventure game, explore unique environments and battle bizarre creatures.
Serious Sam II
Serious Sam II is a shot of adrenaline to the hearts of first-person shooter fans across the world. This is serious!
Star Trek Online
In Star Trek Online, the Star Trek universe appears for the first time on a truly massive scale. Players take the captain's chair as they command their own starship and crew. Explore strange new worlds, seek out new life and new civilizations, and boldly go where no one has gone before.
Unstoppable Gorg
Defend the solar system from fearsome aliens by sending satellites into orbit in revolutionary tower defense action!
Evochron Mercenary
The life of an independent mercenary is rarely without excitement. Your spacecraft awaits and your adventure begins in the Sapphire star system.
SATAZIUS
The year is 2051. Location: SATAZIUS, a long-abandoned planet. The cruiser Agano was on patrol when it was attacked and stricken by a confederacy of space pirates that had established a base on SATAZIUS. The pirates attacked the Agano intending to steal the assault ship ‘Trafalgar’ that was stowed aboard the Agano, but the Trafalgar made...
Earth Defense Force: Insect Armageddon
Thousands of giant insects and aliens once again ravage the earth, and only the Earth Defense Force can stop them.
Galactic Civilizations® II: Ultimate Edition
Get the complete GalCiv II saga including Galactic Civilizations II: Dread Lords, the expansion pack Dark Avatar, and the newest expansion pack Twilight of the Arnor!
Assassin's Creed® Revelations
Ezio Auditore walks in the footsteps of the legendary mentor Altair, on a dangerous journey of discovery and revelation.
AaaaaAAaaaAAAaaAAAAaAAAAA!!! for the Awesome
82 remastered levels from the original and 43 brand new ones that are twice as fast!
Cave Story+
Run, jump, shoot, fly and explore your way through a massive action-adventure reminiscent of classic 8- and 16-bit games.
Serious Sam 3: BFE
Serious Sam 3: BFE is a prequel to the original indie fast action FPS and Game of the Year sensation - Serious Sam: The First Encounter!
Sins of a Solar Empire: Trinity®
In Sins of a Solar Empire: Trinity, you are the leader of a civilization embroiled in a galactic war, fighting for the survival of your entire race against relentless foes.
Gemini Rue
Discover a world where life is cheap, identities are bought & sold, & a quest for redemption can change the fate of a whole galaxy.
Supreme Commander: Forged Alliance
The last days of man are at hand.. Two years after the Infinite War the once great warring nations now lie in ruins, and humanity’s hope for a brighter future is nothing but a bitter memory. A new, seemingly unstoppable enemy, supported by the zealots of The Order, now seeks to eradicate mankind: UEF, Aeon Loyalist, and Cybran alike.
Supreme Commander
For a thousand years, three opposing forces have waged war for what they believe is true. There can be no room for compromise: their way is the only way. Dubbed The Infinite War, this devastating conflict has taken its toll on a once-peaceful galaxy and has only served to deepen the hatred between the factions.
Nuclear Dawn
Explore war-torn post-apocalyptic landscapes and take fight against enemies using various weapons in this FPS/RTS hybrid.
Warhammer 40,000: Space Marine - Anniversary Edition
In Warhammer 40,000 Space Marine you are Captain Titus, a Space Marine of the Ultramarines chapter and a seasoned veteran of countless battles.