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8.9
As Commander Shepard, you lead an elite squad on a heroic, action-packed adventure throughout the galaxy. Discover the imminent danger from an ancient threat and battle the traitorous Saren and his deadly army to save civilization. The fate of all life depends on your actions!
Mass EffectHIGHLY RATED
Windows · Single-player
RPGSci-fiStory RichActionSpace
9.7
The XCOM: Enemy Unknown - Slingshot Pack is Now Available!
| | | | Windows · Linux · Single-player · Multi-player · Cross-Platform Multiplayer · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
Turn-Based StrategyTacticalStrategySci-fiTurn-Based
8.9
Recruit. Explore. Control.Two years after Commander Shepard repelled invading Reapers bent on the destruction of organic life, a mysterious new enemy has emerged. On the fringes of known space, something is silently abducting entire human colonies.
Mass Effect 2HIGHLY RATED
Windows · Single-player
RPGSci-fiStory RichThird-Person ShooterAction
7.8
What if someone knew your mind better than you did? The Swapper is an award-winning, narrative driven puzzle game set in the furthest reaches of space.
| | | | | Windows · Mac · Linux · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Remote Play on TV
PuzzleSci-fiAtmosphericIndieSpace
5.3
State of Mind is a futuristic thriller game delving into transhumanism. The game explores themes of separation, disjuncture and reunification, in a world that is torn between a dystopian material reality and a utopian virtual future.
| | | | | Windows · Mac · Linux · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
Sci-fiAdventureStory RichFuturisticSingleplayer
10.2
This "spaceship simulation roguelike-like" allows you to take your ship and crew on an adventure through a randomly generated galaxy filled with glory and bitter defeat.
| | | | Windows · Mac · Linux · Single-player · Steam Achievements · Steam Trading Cards · Remote Play on Phone · Remote Play on Tablet
RoguelikeSpaceStrategySci-fiIndie
8.3
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.
Windows · Single-player · Multi-player
StrategyRTSSci-fiMultiplayerSingleplayer
8.4
You are Isaac Clarke, an engineer on the spacecraft USG Ishimura. You're not a warrior. You're not a soldier. You are, however, the last line of defense for the remaining living crew.
| | Windows · Single-player · Full controller support · Steam Trading Cards · Remote Play on Phone · Remote Play on Tablet · Remote Play on TV
HorrorSci-fiActionSpaceThird Person
7.0
A dark visual mystery novel featuring transhumanism, traditional marriage, loneliness, and cosplay. Two pursuable characters. Five endings. Welcome to the future.
| | | Windows · Mac · Linux · Single-player · Steam Achievements · Steam Cloud
Visual NovelAnimeIndieSci-fiStory Rich
7.3
PlatinumGames’ revolutionary sci-fi action shooter slide-boosts onto PC. Battle legions of future-tech enemies using a vast arsenal of weapons, including all DLC. Fully unlocked framerate and gorgeous HD resolutions up to 4K. The definitive way to play: war has accelerated.
| | | Windows · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
ActionThird-Person ShooterSci-fiSingleplayerFast-Paced
8.8
It is four thousand years before the Galactic Empire and hundreds of Jedi Knights have fallen in battle against the ruthless Sith. You are the last hope of the Jedi Order. Can you master the awesome power of the Force on your quest to save the Republic? Or will you fall to the lure of the dark side?
| Windows · Mac · Single-player · Steam Cloud
RPGSci-fiStory RichSingleplayerClassic
8.8
Half-Life 2 has sold over 4 million copies worldwide, and earned over 35 Game of the Year Awards. Episode One is the first in a series of games that reveal the aftermath of Half-Life 2 and launch a journey beyond City 17. Also features two multiplayer games. Half-Life 2 not required.
| | | Windows · Mac · Linux · Single-player · Steam Achievements · Captions available · Partial Controller Support · Steam Cloud · Stats · Includes Source SDK · Commentary available · Remote Play Together
FPSActionSci-fiSingleplayerStory Rich
7.4
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.
| | Windows · Multi-player · MMO · Co-op · Steam Achievements · Full controller support · In-App Purchases
Free to PlaySci-fiMassively MultiplayerSpaceRPG
6.9
Take the role of ARID, the artificial intelligence within a high-tech combat suit. The Fall is a unique combination of adventure-game puzzle solving and side-scroller action, all set within a dark and atmospheric story. Get ready for a disturbing journey as you explore the world of The Fall.
| | | | | Windows · Mac · Linux · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
AdventureSci-fiIndieAtmosphericAction
6.8
A ground-based RTS prequel to the classic Homeworld games. Assemble your fleet and lead them to victory on the shifting sands of Kharak in this compelling strategy game for PC from Blackbird Interactive.
| | | | Windows · Mac · Single-player · Multi-player · Steam Achievements · Steam Trading Cards · Steam Cloud · Stats · Steam Leaderboards
StrategyRTSSci-fiMultiplayerStory Rich
8.8
In Prey, you awaken aboard Talos I, a space station orbiting the moon in the year 2032. You are the key subject of an experiment meant to alter humanity forever – but things have gone terribly wrong. The space station has been overrun by hostile aliens and you are now being hunted.
PreyHIGHLY RATED
| | | Windows · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
Sci-fiSpaceAtmosphericSingleplayerHorror
9.3
Command or corrupt an entire galaxy in the definitive Star Wars strategy collection. It is a time of galactic civil war. Will you take up the reins of the Rebellion, assume control of the Empire, or rule the Star Wars Underworld?
Windows · Single-player · Multi-player · PvP · Online PvP · Steam Cloud
StrategyRTSSpaceSci-fiMultiplayer
9.3
Half-Life® 2: Episode Two is the second in a trilogy of new games created by Valve that extends the award-winning and best-selling Half-Life® adventure. As Dr. Gordon Freeman, you were last seen exiting City 17 with Alyx Vance as the Citadel erupted amidst a storm of unknown proportions.
| | | Windows · Mac · Linux · Single-player · Steam Achievements · Captions available · Partial Controller Support · Steam Cloud · Stats · Includes Source SDK · Commentary available · Remote Play Together
FPSActionSci-fiSingleplayerShooter
7.3
The Turing Test is a challenging first-person puzzle game set on Jupiter’s moon, Europa. You are Ava Turing, an engineer for the International Space Agency (ISA) sent to discover the cause behind the disappearance of the ground crew stationed there.
| | | Windows · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
PuzzleFirst-PersonSci-fiSpaceFemale Protagonist
8.7
5 years after the events of the award winning original, the Sith are on the verge of crushing the Old Republic. As a lone Jedi, will you follow the light side or succumb to the dark?
| | | | | Windows · Mac · Linux · Single-player · Steam Achievements · Full controller support · Steam Workshop · Steam Cloud · Remote Play on Tablet
RPGStory RichSci-fiSingleplayerClassic
9.5
From the creators of Amnesia: The Dark Descent comes SOMA, a sci-fi horror game set below the waves of the Atlantic ocean. Struggle to survive a hostile world that will make you question your very existence.
SOMAHIGHLY RATED
| | | | | | Windows · Mac · Linux · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Workshop · Steam Cloud · Remote Play on TV · Remote Play Together
HorrorAtmosphericStory RichSci-fiPsychological Horror
6.5
Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required.
| | | Windows · Single-player · Steam Achievements · Steam Trading Cards · Partial Controller Support · Steam Cloud · Steam Leaderboards
ActionTop-Down ShooterSci-fiSingleplayerTop-Down
6.4
Set in futuristic Tokyo, take control of the robotic community before they control everything!
| | | Windows · Single-player · Multi-player · Co-op · Steam Achievements · Full controller support · Steam Cloud · Steam Leaderboards · Remote Play on TV
ActionThird-Person ShooterSci-fiCyberpunkRobots
7.8
Experience the epic space strategy games that redefined the RTS genre. Control your fleet and build an armada across more than 30 single-player missions. Choose unit types, fleet formations and flight tactics for each strategic situation.
| | Windows · Single-player · Multi-player · Steam Achievements · Steam Workshop · Steam Cloud
SpaceStrategyRTSSci-fiClassic
9.4
Discover the true meaning of fear in Alien: Isolation, a survival horror set in an atmosphere of constant dread and mortal danger.
Alien: IsolationHIGHLY RATED
| | | | Windows · Mac · Linux · Single-player · Steam Achievements · Full controller support · Steam Cloud · Remote Play on TV
HorrorSurvival HorrorSci-fiAtmosphericAliens
7.5
Life has ceased. Man is but a myth. And now, even the machines have begun to fail. Lead Horatio Nullbuilt and his sarcastic sidekick Crispin on a journey through the crumbling world of Primordia, facing malfunctioning robots, ancient secrets, and an implacable, power-hungry foe.
| | Windows · Single-player · Steam Achievements · Steam Trading Cards
Point & ClickAdventurePost-apocalypticSci-fiIndie
5.6
The year is 1962 and the Cold War has the nation gripped by fear.  A top-secret government unit called The Bureau begins investigating a series of mysterious attacks by an enemy more powerful than communism.
| | | | Windows · Mac · Single-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Remote Play on TV
ActionSci-fiTacticalThird-Person ShooterSingleplayer
7.8
Made by Gearbox Software and originally released in 2001 as an add-on to Half-Life, Blue Shift is a return to the Black Mesa Research Facility in which you play as Barney Calhoun, the security guard sidekick who helped Gordon out of so many sticky situations.
| | Windows · Mac · Linux · Single-player · Remote Play Together
FPSActionSci-fiSingleplayerShooter
8.8
Developed by 5pb. and Nitroplus, STEINS;GATE was awarded Famitsu magazine's coveted annual Game of Excellence award and was voted one of the most emotionally charged “tear-inducing games” ever made, in a Famitsu poll. It is a gripping and moving Visual Novel, which has already spawned manga and anime adaptations.
STEINS;GATEHIGHLY RATED
| | Windows · Single-player · Steam Achievements · Steam Trading Cards · Partial Controller Support · Steam Cloud · Remote Play on Phone · Remote Play on Tablet
Visual NovelStory RichAnimeTime TravelSci-fi

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