Best Sci-fi games on Steam
Unlike generic lists, our strategy game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated sci-fi games. For those who prefer not to search, lists of the most played, top deals and best free sci-fi games are available at the bottom of the page.
Filters & Lists
Homeworld: Deserts of Kharak
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.
The Bug Butcher
A fast paced action shooter inspired by the arcade classic Super Pang! Use a wide selection of weapons and powerups to tear through increasingly challenging levels.
The Deadly Tower of Monsters
Fire up your ray guns, crystal swords, and laser whips, and get ready for thrills and chills! With three incredible movie stars playing out decidedly B-level sci-fi exploits, Dick Starspeed, Scarlet Nova, and Robot will have you ready to jump off the side of the tower—right into adventure!
Evochron Legacy SE
Advanced Space Flight, Combat, Trading, and Exploration Simulation. Set in a vast explorable universe, Evochron Legacy offers freeform gameplay with many diverse objectives and paths to choose from.
Sol 0: Mars Colonization
Sol 0 is a real time strategy game where you establish the first Martian colony. From the first human footprints on Martian soil to a thriving and self-sustaining colony, Sol 0 imagines a near future using technology that could be available within the next few decades.
Tharsis
Succeeding in Tharsis requires you to make the best of what you have, even if it happens to be a pair of snake eyes. Certain factors may be outside of your control, but that doesn’t mean they can’t be overcome. Tharsis is not a game about facing the odds. It’s a game about changing them.
Space Pilgrim Episode II: Epsilon Indi
One year after the events of Episode I, Captain Pilgrim is once again carrying a shipload of passengers between star systems. This time her guests include a mysterious priestess, a wayward youth and a robotics genius.
Space Pilgrim Episode I: Alpha Centauri
Captain Gail Pilgrim has been flying starships since she was a kid, ferrying passengers between planets and space stations across the galaxy. She has no reason to expect that this latest trip to Alpha Centauri will be anything special, even if her passengers are a little more diverse than usual....
UnderRail
Underrail is an old school turn-based isometric indie role playing game that focuses on exploration and combat. The game is set in a distant future, when the life on the Earth’s surface has long since been made impossible and the remnants of humanity now dwell in the Underrail, a vast system of metro station-states that, it seems, are...
Total Annihilation
What began as a conflict over the transfer of consciousness from flesh to machines escalated into a war which has decimated a million worlds. The Core and the Arm have all but exhausted the resources of a galaxy in their struggle for domination.
MechWarrior Online™ Legends
MechWarrior Online™ Legends is a tactical, 'Mech-based online shooter set in the vast BattleTech Universe. Assume the role of an elite MechWarrior, piloting powerful BattleMechs, fighting for supremacy over the Inner Sphere.
City of Chains
City of Chains is a dark sci-fi RPG set in a dystopian city. Take control of a small group of escaped fugitives and lead them to their freedom. Decide whether to fight head on or to avoid combat, to help others or to go your own way, to show mercy or to kill. Your actions could affect the fate of the city.
HELLDIVERS™ Dive Harder Edition
HELLDIVERS™ is a hardcore, cooperative, twin stick shooter. As part of the elite unit called the HELLDIVERS, players must work together to protect SUPER EARTH and defeat the enemies of mankind in an intense intergalactic war.
AX:EL - Air XenoDawn
Combining the very best of sci-fi and aerial dogfighting gameplay, AX:EL delivers a totally new gaming experience. Create your very own shape-shifting vehicle and dominate both the sky and the ocean.
DARIUSBURST Chronicle Saviours
DARIUSBURST Chronicle Saviours is the latest installment in Taito's DARIUS series of arcade-style shooting games. Blast hordes of alien sea-monsters, and blaze your own trail through branching environments.
The Last Dream: Developer's Edition
“Reality and dreams are about to become entwined…..” The Last Dream: Developer's Edition" is a casual adventure game which, despite having some classic casual elements, will also offer a greater challenge for more experienced gamers.
Impossible Creatures Steam Edition
Impossible Creatures is a 3D RTS game that pits the player against an evil villain. Using Earth’s most formidable animals as building blocks, the player must create an army of genetically-altered mutant monsters in a titanic struggle to protect an unsuspecting world.
FortressCraft Evolved!
FortressCraft Evolved is a unique blend of Voxel Landscapes, Tower Defense, Crafting, Logistics, Exploration, Combat and Assembly lines. Players begin by crash-landing on a strange alien world, left with only a small handful of starting machines.
ePic Character Generator
Create realistic or hand-drawn character images you can use as assets for your games, illustrations for your stories, or avatars for your role-playing sessions. Export your images as PNG files with or without a background, or as a layered PSD image for further customization.
Call of Duty®: Black Ops III
Call of Duty®: Black Ops III Zombies Chronicles Edition includes the full base game plus the Zombies Chronicles content expansion.
Anno 2205™
In Anno 2205™, you join humankind‘s next step into the future with the promise to build a better tomorrow. You conquer Earth, establishing rich, bustling cities and grand industrial complexes, but to secure the prosperity of your people, you must travel into space.Most played sci-fi games on Steam
Take a look at the top sci-fi games that are currently attracting the largest player bases on the Steam platform, as of April 19th 2025.
1. Stellaris
Explore a galaxy full of wonders in this sci-fi grand strategy game from Paradox Development Studios. Interact with diverse alien races, discover strange new worlds with unexpected events and expand the reach of your empire. Each new adventure holds almost limitless possibilities. Stellaris is a space, grand strategy and strategy game developed by Paradox Development Studio and published by Paradox Interactive. Released on May 09th 2016 has received 181,916 reviews of which 157,721 were positive and 24,195 were negative resulting in a rating of 8.6 out of 10. The game has hit the top spot as the #1 most played sci-fi game, thanks to its 12,543 peak concurrent players over the last day.
8.6
157,721
24,195
12,543
players
2. No Man's Sky
No Man's Sky is a game about exploration and survival in an infinite procedurally generated universe. No Man's Sky is a open world, open world survival craft and space game developed and published by Hello Games. Released on August 12th 2016 has received 349,909 reviews of which 290,482 were positive and 59,427 were negative resulting in a rating of 8.2 out of 10. While seeing 9,228 players online at once in the last 24 hours, this game is currently ranked #2 among sci-fi games based on player count.
8.2
290,482
59,427
9,228
players
3. Elite Dangerous
Take control of your own starship in a cutthroat galaxy. Elite Dangerous is the definitive massively multiplayer space epic. Elite Dangerous is a space sim, space and open world game developed and published by Frontier Developments. Released on April 02nd 2015 has received 99,111 reviews of which 76,646 were positive and 22,465 were negative resulting in a rating of 7.7 out of 10. While seeing 7,265 players online at once in the last 24 hours, this game is currently ranked #3 among sci-fi games based on player count.
7.7
76,646
22,465
7,265
players
4. Brotato
Brotato is a top-down arena shooter roguelite where you play a potato wielding up to 6 weapons at a time to fight off hordes of aliens. Choose from a variety of traits and items to create unique builds and survive until help arrives. Brotato is a rogue-like, singleplayer and action roguelike game developed and published by Blobfish. Released on June 23rd 2023 has received 95,805 reviews of which 92,641 were positive and 3,164 were negative resulting in an impressive rating of 9.5 out of 10. With 4,457 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played sci-fi games.
9.5
92,641
3,164
4,457
players
5. Mass Effect™ Legendary Edition
The Mass Effect™ Legendary Edition includes single-player base content and over 40 DLC from the highly acclaimed Mass Effect, Mass Effect 2, and Mass Effect 3 games, including promo weapons, armors, and packs — remastered and optimized for 4K Ultra HD. Mass Effect™ Legendary Edition is a story rich, rpg and choices matter game developed by BioWare and published by Electronic Arts. Released on May 14th 2021 has received 54,992 reviews of which 50,066 were positive and 4,926 were negative resulting in a rating of 9.0 out of 10. With 3,230 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played sci-fi games.
9.0
50,066
4,926
3,230
players
6. STAR WARS™ Empire at War - Gold Pack
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? STAR WARS™ Empire at War - Gold Pack is a strategy, rts and space game developed by Petroglyph and published by LucasArts, Lucasfilm and Disney. Released on May 25th 2010 has received 38,829 reviews of which 37,908 were positive and 921 were negative resulting in an impressive rating of 9.6 out of 10. With 1,932 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played sci-fi games.
9.6
37,908
921
1,932
players
7. BATTLETECH
Take command of your own mercenary outfit of 'Mechs and the MechWarriors that pilot them, struggling to stay afloat as you find yourself drawn into a brutal interstellar civil war. BATTLETECH is a mechs, strategy and turn-based tactics game developed by Harebrained Schemes and published by Paradox Interactive. Released on April 24th 2018 has received 31,367 reviews of which 26,263 were positive and 5,104 were negative resulting in a rating of 8.2 out of 10. With 1,812 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played sci-fi games.
8.2
26,263
5,104
1,812
players
8. FTL: Faster Than Light
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. FTL: Faster Than Light is a rogue-like, space and strategy game developed and published by Subset Games. Released on September 14th 2012 has received 74,438 reviews of which 71,021 were positive and 3,417 were negative resulting in an impressive rating of 9.4 out of 10. With 1,801 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played sci-fi games.
9.4
71,021
3,417
1,801
players
9. 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 is a fps, action and sci-fi game developed and published by Valve. Released on November 16th 2004 has received 241,625 reviews of which 235,834 were positive and 5,791 were negative resulting in an impressive rating of 9.7 out of 10. With 1,757 concurrent players in the last 24 hours, the game currently holds the #9 spot among the most played sci-fi games.
9.7
235,834
5,791
1,757
players
10. 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. Star Trek Online is a free to play, sci-fi and massively multiplayer game developed by Cryptic Studios and published by Arc Games. Released on January 31st 2012 has received 20,017 reviews of which 15,828 were positive and 4,189 were negative resulting in a rating of 7.8 out of 10. With 1,200 concurrent players in the last 24 hours, the game currently holds the #10 spot among the most played sci-fi games.
7.8
15,828
4,189
1,200
players
Best deals on sci-fi games on Steam
Discover fantastic savings with the best discounts on a variety of sci-fi games available on Steam right now, updated on April 19th 2025. Looking for even more deals? Use the search filters to explore a wider range of discounted sci-fi games.
1. Citizen Sleeper
Roleplaying in the ruins of interplanetary capitalism. Live the life of an escaped worker, washed-up on a lawless station at the edge of an interstellar society. Inspired by the flexibility and freedom of TTRPGs, explore the station, choose your friends, escape your past and change your future. Citizen Sleeper is a rpg, dice and story rich game developed by Jump Over The Age and published by Fellow Traveller. Released on May 05th 2022 has received 7,821 reviews of which 7,266 were positive and 555 were negative resulting in an impressive rating of 9 out of 10. Featuring a massive 95% discount, this game currently holds the #1 spot in the best deals for sci-fi category.
9
7,266
555
-95%
20.00€
1.00€
2. Observation
Observation is a sci-fi thriller uncovering what happened to Dr. Emma Fisher, and the crew of her mission, through the lens of the station’s artificial intelligence S.A.M. Observation is a indie, adventure and space game developed by No Code and published by Devolver Digital. Released on May 21st 2020 has received 4,740 reviews of which 3,717 were positive and 1,023 were negative resulting in a rating of 7.6 out of 10. Thanks to its incredible 95% discount, this game is now the #2 best deal in sci-fi games.
7.6
3,717
1,023
-95%
26.80€
1.34€
3. INDUSTRIA
Embark on a gripping journey in INDUSTRIA, an atmospheric FPS set in Cold War-era East Berlin. Unravel the secrets of a mysterious parallel dimension while searching for a missing colleague. Explore a haunting reality where the truth awaits. Discover the dark past that lies beyond. INDUSTRIA is a fps, action and sci-fi game developed by Bleakmill and published by Headup. Released on September 30th 2021 has received 3,188 reviews of which 2,265 were positive and 923 were negative resulting in a rating of 6.9 out of 10. Thanks to its incredible 95% discount, this game is now the #3 best deal in sci-fi games.
6.9
2,265
923
-95%
20.00€
1.00€
4. The Entropy Centre
Think in reverse. Outsmart the impossible. A mind-bending first-person adventure where you solve ingenious and complex puzzles by rewinding objects through time. The Entropy Centre is a puzzle, first-person and sci-fi game developed by Stubby Games and published by Playstack. Released on November 03rd 2022 has received 3,453 reviews of which 3,106 were positive and 347 were negative resulting in a rating of 8.7 out of 10. Currently offered at a significant 94% discount, this title has earned the #4 position in the best deals for sci-fi games.
8.7
3,106
347
-94%
18.50€
1.11€
5. Homeworld Remastered Collection
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. Homeworld Remastered Collection is a space, strategy and rts game developed by Gearbox Software and Aspyr (Mac) and published by Aspyr (Mac) and Gearbox Publishing. Released on February 25th 2015 has received 13,513 reviews of which 11,942 were positive and 1,571 were negative resulting in a rating of 8.6 out of 10. Currently offered at a significant 94% discount, this title has earned the #5 position in the best deals for sci-fi games.
8.6
11,942
1,571
-94%
33.33€
2.00€
6. The Gunk
The Gunk is an action-adventure game in which you play as Rani, part of our duo of gritty space haulers. As they’re struggling to bring in funds, they chance upon an untouched planet brimming with life. They came in search of valuable resources, and it looks like they’ve hit the jackpot… The Gunk is a action-adventure, atmospheric and sci-fi game developed by Image & Form Games and published by Thunderful Publishing. Released on April 29th 2022 has received 2,588 reviews of which 2,226 were positive and 362 were negative resulting in a rating of 8.3 out of 10. Currently offered at a significant 94% discount, this title has earned the #6 position in the best deals for sci-fi games.
8.3
2,226
362
-94%
24.33€
1.46€
7. Hellpoint
Hellpoint is an intense action RPG taking place on Irid Novo, a derelict space station soaked in an intoxicating dark sci fi atmosphere. Fight dreadful creatures, face the Cosmic Gods and unravel their twisted story. Should the challenge be too great, play with a friend in local or online coop. Hellpoint is a souls-like, sci-fi and action game developed by Cradle Games and published by tinyBuild. Released on July 30th 2020 has received 4,267 reviews of which 3,124 were positive and 1,143 were negative resulting in a rating of 7.1 out of 10. Currently offered at a significant 94% discount, this title has earned the #7 position in the best deals for sci-fi games.
7.1
3,124
1,143
-94%
31.33€
1.88€
8. SPRAWL
SPRAWL is a hardcore retro FPS set in an endless cyberpunk megalopolis. Escape the walled city and take on the militarized government of the sprawl. Fueled by the blood of your enemies and a mysterious voice in your head, make your way towards the spire to topple whatever lays within. SPRAWL is a controller, sci-fi and combat game developed by MAETH and published by Rogue Games and Inc.. Released on August 23rd 2023 has received 1,950 reviews of which 1,712 were positive and 238 were negative resulting in a rating of 8.4 out of 10. Currently offered at a significant 93% discount, this title has earned the #8 position in the best deals for sci-fi games.
8.4
1,712
238
-93%
15.14€
1.06€
9. Shadowrun Returns
The unique cyberpunk-meets-fantasy world of Shadowrun has gained a huge cult following since its creation nearly 25 years ago. Now, creator Jordan Weisman returns to the world of Shadowrun, modernizing this classic game setting as a single player, turn-based tactical RPG. Shadowrun Returns is a rpg, cyberpunk and turn-based game developed by Harebrained Schemes and published by Paradox Interactive. Released on July 25th 2013 has received 13,339 reviews of which 11,792 were positive and 1,547 were negative resulting in a rating of 8.6 out of 10. Currently offered at a significant 92% discount, this title has earned the #9 position in the best deals for sci-fi games.
8.6
11,792
1,547
-92%
15.50€
1.24€
10. Scars Above
Scars Above is a challenging sci-fi third-person action adventure shooter combining the rewarding feel of overcoming difficulty with a compelling and intricate story, set in a mysterious alien world to explore. Scars Above is a action, adventure and female protagonist game developed by Mad Head Games and published by Prime Matter. Released on February 28th 2023 has received 2,681 reviews of which 2,070 were positive and 611 were negative resulting in a rating of 7.5 out of 10. Currently offered at a significant 92% discount, this title has earned the #10 position in the best deals for sci-fi games.
7.5
2,070
611
-92%
31.25€
2.50€
Free sci-fi games on Steam
Check out this fantastic list of free-to-play sci-fi games you can enjoy on Steam right now, updated on April 19th 2025. Looking for even more free titles? Use the search filters to explore a wider range of free to play sci-fi games.
1. 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. Star Trek Online is a free to play, sci-fi and massively multiplayer game developed by Cryptic Studios and published by Arc Games. Released on January 31st 2012 has received 20,017 reviews of which 15,828 were positive and 4,189 were negative resulting in a rating of 7.8 out of 10. With 1,200 active players enjoying it for free, this strategy game has reached the #1 spot among the top free sci-fi games on Steam.
7.8
15,828
4,189
1,200
players
2. Pixel Starships
Pixel Starships is an FTL-style online sci-fi strategy builder and management game with a competitive PVP tournament. Set in the retro galaxy, your role is to explore space, meet aliens, and develop your ship, crew and AI. The game contains deep strategic and 4x elements. PSS is community-driven. Pixel Starships is a sci-fi, space and strategy game developed and published by SavySoda. Released on May 23rd 2023 has received 2,684 reviews of which 1,976 were positive and 708 were negative resulting in a rating of 7.1 out of 10. Thanks to its free to play tag and a daily player base of 164, this sci-fi game has secured the #2 spot in the ranking of free sci-fi games on Steam.
7.1
1,976
708
164
players
3. Endless Sky
Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters. Endless Sky is a space, free to play and open world game developed and published by Michael Zahniser. Released on October 30th 2015 has received 6,579 reviews of which 6,074 were positive and 505 were negative resulting in a rating of 8.9 out of 10. Thanks to its free to play tag and a daily player base of 131, this sci-fi game has secured the #3 spot in the ranking of free sci-fi games on Steam.
8.9
6,074
505
131
players
4. Hades' Star
A unique space strategy game where thousands of players participate in one shared galaxy. Hades' Star is a free to play, space and strategy game developed and published by Parallel Space Inc. Released on February 27th 2019 has received 2,561 reviews of which 1,864 were positive and 697 were negative resulting in a rating of 7.1 out of 10. Attracting a solid base of 123 players due to its free access, this strategy game has achieved the #4 position in the best free sci-fi games on Steam.
7.1
1,864
697
123
players
5. Prosperous Universe
In Prosperous Universe start your galactic empire by trading on the real-time market exchange with other real players. Build your 1st base from humble beginnings & watch as your business flourishes with complex supply chain strategies. Economics, politics & realism fuel this immersive business MMO. Prosperous Universe is a early access, economy and resource management game developed and published by simulogics. Released on April 20th 2022 has received 883 reviews of which 665 were positive and 218 were negative resulting in a rating of 7.2 out of 10. The game currently holds the #5 spot among the most played free sci-fi games on Steam.
7.2
665
218
22
players
6. 买个可乐饼吧！ - Buy a Croquette!
March 2012, Nagano. The smart and brave high school girl, Chio Aozora, is facing a major crisis: she has no money to buy a croquette! Navigate through the streets and alleys of Nagano, interact with a variety of characters, solve complex puzzles, collect 380 yen in coins, and buy a croquette! 买个可乐饼吧！ - Buy a Croquette! is a rpgmaker, sci-fi and mystery game developed by 越青 and published by Eternal Dream. Released on April 27th 2024 has received 4,099 reviews of which 4,062 were positive and 37 were negative resulting in an impressive rating of 9.5 out of 10. The game currently holds the #6 spot among the most played free sci-fi games on Steam.
9.5
4,062
37
10
players
7. AX:EL - Air XenoDawn
Combining the very best of sci-fi and aerial dogfighting gameplay, AX:EL delivers a totally new gaming experience. Create your very own shape-shifting vehicle and dominate both the sky and the ocean. AX:EL - Air XenoDawn is a action, indie and simulation game developed by Alex Piola and published by KISS ltd. Released on December 04th 2015 has received 1,181 reviews of which 891 were positive and 290 were negative resulting in a rating of 7.2 out of 10. The game currently holds the #7 spot among the most played free sci-fi games on Steam.
7.2
891
290
7
players
8. Terraformers: First Steps on Mars
Terraformers: First Steps on Mars is a free prologue of Terraformers, featuring an exclusive challenge to lead humanity's first attempt at settling the Red Planet. Terraformers: First Steps on Mars is a strategy, simulation and colony sim game developed by Asteroid Lab and published by Goblinz Publishing and IndieArk. Released on October 23rd 2021 has received 680 reviews of which 608 were positive and 72 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #8 spot among the most played free sci-fi games on Steam.
8.4
608
72
5
players
9. South Scrimshaw, Part One
South Scrimshaw is the story of a newborn whale in a vast alien ocean. It is a richly illustrated experimental visual novel, written in the style of a nature documentary. South Scrimshaw, Part One is a linear, sci-fi and hand-drawn game developed and published by Nathan O. Marsh. Released on June 09th 2023 has received 1,348 reviews of which 1,337 were positive and 11 were negative resulting in an impressive rating of 9.4 out of 10. The game currently holds the #9 spot among the most played free sci-fi games on Steam.
9.4
1,337
11
1
players
10. Space Pilgrim Episode I: Alpha Centauri
Captain Gail Pilgrim has been flying starships since she was a kid, ferrying passengers between planets and space stations across the galaxy. She has no reason to expect that this latest trip to Alpha Centauri will be anything special, even if her passengers are a little more diverse than usual.... Space Pilgrim Episode I: Alpha Centauri is a adventure, rpgmaker and sci-fi game developed by Pilgrim Adventures and GrabTheGames Studios and published by GrabTheGames and TheGamesFortress. Released on December 21st 2015 has received 1,245 reviews of which 1,096 were positive and 149 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #10 spot among the most played free sci-fi games on Steam.
8.4
1,096
149
1
players