Free Sci Fi Games

Free 2D/3D Offline Adult Games.

VoidBound New Version 0.6d Steam EA Cursed-Atelier

The Earth is sucked into a war between alien species, and the heroine has to venture to worlds never before seen by mankind to find a way to stop it. The game is a sci-fi ero RPG with a focus on variety in combat mechanics. The character’s abilities will be determined by a wide variety of equipable weapons, psi amps, and support gear, and each combat area will have its own unique spin on battles.
BOOBIES Version 0.3b Lascavia Studio

You play as a guy that has the power to save heroines/girls from different parts in the multiverse after the destruction of their universe.
You will provide homes to them in your base called zone zero.
You identify them as BIOLOGICAL OTHERWORLD ORGANISM BEINGS IN EXILE.
B.O.O.B.I.E.S for short.
Take good care of them and eventually, they’ll be a part of your loyal harem!
Lust Survivor New Version 0.7 Moccasin#8217s Mirror

Seven girls crashland on an uninhabited planet after an accident, they will have to survive until help arrives and learn how to deal with each other. Hours ago the girls were just students from different careers on route to a far away research site for different reasons. Some girls know each other but nobody was remotely prepared for the situation. The group needs to start getting along and doing something if they want to get rescued or at least survive.
Color of My Sound New Chapter 3A Version v6 Gallant Trombe

Info:
Color of My Sound is a Sci-Fi, Espionage, Drama, Erotic visual novel set in an original setting. It is a universe chock full of potential for character drama, conspiracies, espionage, intrigue and action.
The story began when a rebellion on an unprecedented scale erupted across the Empire’s worlds and humanity faces an uncertain future for the first time since the Empire’s inception. The infamous day has abruptly altered the lives of many, including our protagonist.
Follow the story of the Officer, as he carefully manoeuvres around the machinations of various powers of the Empire, each vying for his allegiance or death…
As the commanding officer of Special Operations Squad “Nu”, form camaraderie, rivalry, and even romance with your team members. Careful, each member has their own hidden agendas and personal stake. Pay careful attention, trust no one, you will need to earn the loyalty, perhaps even love of each member to survive this journey.
Stellar Incognita New Version 0.9.5 Slamjax Games

Stellar Incognita is a sci-fi visual novel with multiple branching paths and endings, built around the central themes of mind control and corruption.
The year is 3922 and humanity is colonizing the vast reaches of a wild and unknown space, known as the STELLAR INCOGNITA. You play the role of Sagacious-6, a nefarious and opportunistic clone worker that researches forbidden technologies for mind manipulation and corruption, in order to seek a life of indulgence and self-satisfaction. Set on a mission of revenge at the outset of the story, what fate awaits Sagacious-6 in the STELLAR INCOGNITA?
The Last Star Walker Version 0.1 Veluxa

In the vast cosmos, two realms stand out: Navā, a mystical world where magic flows freely, and Terra,
a technological marvel at the peak of innovation. Both face exploitation by power-hungry elites.
As the boundaries between Navā and Terra begin to blur, a critical question arises:
What happens when these worlds collide?
Will you side with the Extinctionists, who believe one world must dominate the other, or the Expansionists,
who seek a harmonious fusion of magic and technology?
Or will you forge your own path, bridging the divide between duty and desire, love and vengeance?
The fate of humanity rests in your hands.
Stellar Dream New Version 0.55 Winterlook

Stellar Dream tells a story about a colony ship set to find new worlds suitable for human colonization.
Scouts were send to three most suitable candidates but communication with them has been lost.
The player’s task is to bring the scouts home,
find a suitable home for the colony and establish diplomatic relations with alien life forms.
Sexbot Restoration 2124 New Version 0.8.0 squirrel24

You were a geeky kid and spent most of your time tinkering with broken down sexbots instead of studying in school. Since you never studied you never graduated from high school. Your parents were fed up and kicked you out when you turned 18. At least they gave you a little money.
You decided to use the money they gave you to buy tools and rent space in an old warehouse and try to start a business repairing sexbots. Unfortunately you learned that starting a business is difficult. You’ve been living in the warehouse where your shop is located and struggling to make ends meet for almost a year. Maybe if you’d studied at school you’d have a better chance of making this work!
‘Sexbot Restoration 2124’ (SR24) is a variant of ‘Defective Sexbot Chop Shop’ (DSCS) by Radnor.
Exilium Breeding Empire New Version 0.1.7 Nocturnal Illusions

Exilium – Breeding Empire is an adult NSFW game that blends the strategic depth of worker placement and base building mechanics with the thrilling challenge of survival in a setting filled with mystery and danger. Set against the backdrop of a foreboding alien world, players must navigate the complexities of managing resources, enhancing their base, and assigning tasks to a diverse group of survivors. Each decision impacts not only the survival of the colony but also its ability to thrive amidst the unknown.
How To Fix The Future Chapter 1 New Version 0.3.2 mr.moonmi

A young man lives an ordinary life. Working as a simple salesman, he escapes reality by playing video games at night. Life hasn’t been fair to him, but everything changes when people around the world start getting mysterious game disks. And when two agents from the future show up, he suddenly becomes involved in the most incredible adventure of his life.
Discover the secrets of time. Meet beautiful girls on your journey. And make decisions that will change the flow of time.
This is a story oriented sci-fi adventure novel. Where events will take place both in our time and in the near future.
SlutCraft Heat of the Sperm New Version 0.42 Shadow Portal

It seems like Sarah Kerrigan was a loyal member of Sons of Korhal and obeyed Arcturus Mengsk’s orders to every syllable just yesterday. But who would’ve thought that Mengsk didn’t forgive Sarah for killing his father.
Because of his plots and betrayal, a secret operation on Tarsonis, the capital of the Confederation, turned into a bloodbath and a ‘captive’ status for Sarah herself, but as she found out later, it was just another hard way to promising new opportunities. Opportunities to become stronger. To get revenge. To get some pleasure…
This is a story about Sarah Kerrigan’s path from a loyal soldier to a powerful (and sexy) Queen of Blades.
Life on Mars Chapter 1 New Version 0.6 MiZtyl

At the end of the 24th century, humans succeeded in terraforming Venus and Mars. But just a few decades later, a war broke out when the colonists wanted to gain independence. The War ended in the middle of the 25th century with a peace treaty to end the Solar Federation as well as the sovereignty of Earth. The story begins at the start of the 26th century on Earth. It’s also the 1st century of the new calendar on Mars. The Martians are trying to distinguish themselves from Earth. Our main protagonist is a senator’s assistant. His boss is running for Chancellor this year. One of her promises is to end the legal status of polygamy and polyandry. But what about the main protagonist? Is he also against polygamy and polyandry? His decisions will shape the story of Life on Mars.
FemCity New Version 0.6.0 Kiriowo

In this game you play as a man, who stuck in the city where males are discriminated while females rule everything in this dark cyberpunk future.
Will you able to survive and more of that, manage to escape from the FemCity?
The Pilgrimage New Final Version 2.10 Full Game Messman

Between her adventures with famous commander Tali Zorah went to her pilgrimage to help quarian Flotilla. What can goes wrong? Seems like everything.
Haremwatch Juno Has Landed Final Version 1.0 Full Game Gachapen Games

The young Space Traveler from Mars lands on Earth and onto your heart in this short story.
This is a standalone build to introduce an upcoming character to the main Haremwatch build. Available in browser, and for windows, android, and mac.
Shelly’s Future Past New Episode 2.2 SexyShelly

Shelly’s Future Past is a Sci Fi Erotic Lesbian Time Travel Adventure, about a female protagonist 23 year old lesbian woman, who lives in the year 3077 within Cyber City with her best friend Triss
Shelly, who, has lived a emotional rollercoaster life, is special in way that will come to light in this visual novel
A Mystery Lady from the future, that knows Shelly very well, travels back in time to find Shelly and asks her for her help to stop the end of the world from 5 very powerful men in the future that have taken control of the Earth
Shelly thinks she is travelling back in time to change the past to save the future, but, will quickly find out she is actually needs to correct the time line
Shelly is asked to travel back in time, to five very different time lines, to find 5 straight woman, one on each time line and find a way to stop them from ever getting pregnant, no one knows who their children’s father is, but Shelly needs to stop each woman from getting pregnant which will stop 5 powerful men own great grand parents from ever being born, resulting in them never being born, this will then will save the future and end the war
But it won’t be easy, as one of the powerful men is also travelling back in time.
Light-Space Love Version 0.46 Added Android Port Halftilt

The game takes place in the year 8643. You play as Captain Linessa Star,
Commander of Repopulation Colony: Deep Six Nine.
Deep Six Nine is one colony in the galaxy among many that were founded by the Federation.
The Federation is responsible for assisting Xeno species that are in danger of extinction by helping them reproduce.
The Federation achieves this goal by utilizing genetic technology that allows members of the Federation,
to get impregnated by (or to impregnate) members of different species.
As Captain of Deep Six Nine, it is your duty to form bonds with other Xeno species,
and recruit their people into your colony to take part in its breeding efforts.
The story takes place after an incident that occurred with Captain Linessa Star in which she,
had unexpectedly returned from a year-long relationship-building mission with much of her memories erased.
Unsure of what happened to her, she wishes to discover who she is,
what happened to her, and how she can rebuild her colony which has fallen into disarray in her absence.
You will unlock different worlds to explore within the galaxy to visit in order to recruit Xenos,
into your colony and to uncover the mystery behind her lost memories.
Space Journey X New Final Version 1.40.18 Full Game y.v.

Our human hero is hurled across space alongside an alien female deep space explorer, whose ship he accidentally destroyed…
Supported by an overconfident drone and a mysterious passenger, it is our hero’s task to make his fortune and embark on the long journey back home, while dealing with alien women, crazy sex-bots and adventurers in his path…
Star Periphery Version 0.5.5 Added Android Port VoidPilgrim

A futadom/femdom retro sci-fi adventure game focused on atmosphere and immersion.
The setting’s main inspirations are cult classics like Fifth Element, Farscape, Space Truckers, Red Dwarf, Battletech, Syd Mead’s paintings, and other similar older sci-fi works. I am hoping to emulate that seedy, B-movie, lived-in atmosphere. Dirty and functional environments but still immersive and fun enough to live in. You can check the screenshots above and let me know if this goal of mine succeeded or not.
Or at least, this all applies to The Periphery, where most of Part 1 will be situated. What else is there waiting for you in this vast new universe? You’ll see!
Star Warrior and Space Girls New Version 0.3 Demo Typiconart

Typiconart presenting an adult visual novel story about Melivan Canscand,
that become on a third year of the Clone Wars a Jedi Knight and joined to Ahsoka Tano and clones army.
Experience this story and choose destiny of characters.
Hybridia New Version 0.4.56 Black Hood Games

As you take your final breath, the darkness descends upon you.
But just when you think it’s all over, a deity appears before you.
It’s none other than Aphrodite, offering you a chance to live again in a brand new world called Hybridia.
Who could resist such an alluring offer?
But as you awaken in your new body, you quickly realize that Aphrodite has not been entirely forthcoming with you. As her newly appointed Champion, you now possess an unusual power – the power of Lust. But that’s not all. You soon discover that you are not alone in this world, as other Champions from different deities are coming to challenge you. The reason why is unknown, and why you were chosen remains a mystery. And who the heck is Steve? The enigma only deepens.
The path ahead of you is full of obstacles and challenges, as you navigate the intricate world of Hybridia. Will you succumb to the temptation of your newfound power, or will you rise up and become the ultimate Champion? The choice is yours, but choose wisely. Your destiny awaits in Hybridia.
The Long Way New Version 0.08.0 Muffin Maker

With the 13 Galaxies in limbo, your quest, if you choose to accept it, is to turn order into chaos, strength into weakness and leaders into puppets.
While there is still very little content (understatement of the year), the mechanics of the game have been resolved to allow for an almost infinite cast of characters and locations.
Our next target for the game is character interactions and creating the first of many worlds.
Parasite Inside New Version 0.2.1 Kodman

In this gripping Sci-Fi Horror game, our protagonist, Oni Lim, awakens aboard a colonization spaceship. However, as she awake from her slumber, she quickly realizes that all other crew members remain in cryogenic stasis, and critical ship systems are malfunctioning. Determined to uncover the source of the problem, Oni embarks on a perilous journey through the labyrinthine corridors of the ship. What she discovers amidst the flickering lights and ominous shadows is nothing short of shocking.
Hardcoded New Version 0.9 Patreon Fortunae Virgo

Hardcoded is an open-world dating-sim, set in the lawless reaches of a cyberpunk dystopia, in which you take on the role of a thinking/learning droid who has recently escaped her owners and is on the run. Before you can fully settle into your new life, it becomes obvious that Pira City is a place of dark and dangerous secrets. Fortunately, you’re able to befriend a cast of very horny characters who seek your aid in pursuing a shadowrun-style investigation. You can spend your down time trying to establish yourself, by earning money, decorating your apartment, buying clothes, collecting sci-fi dildos, or working on turning friendships into romances.
!!!This game is very explicit! There are many dicks in this game! Most of them are attached to girls!!!
Tunnel Escape New Final Version 1.0.6 Steam Full Game Elzee

The story takes place in a city infected by a zombie virus.
In order to avoid zombies, the heroine accidentally entered an underground secret biological laboratory and discovered a shocking secret. Since then, she has embarked on a journey to save mankind.
UFO Chapter 3 Version 0.6.7 Added Android Port 17MOONKEYS

A man was abducted by aliens, but after 1000 years his cryogenic chamber will be found by sex dolls.
Mech Academy New Version 0.5.17.1 Space Samurai Games

Mech Academy is an adult visual novel based on multiple-choice decisions. The player will take on the role of the protagonist in this story and meet different characters and try to develop a relationship with them. The player’s decisions will have an impact on the evolution of the story.
“It is the year 2175, and you are the pilot of a Mech Guardian. These are giant war machines built to defend Earth from the Noxa, a ruthless alien race intent on conquering your planet. However, you do not belong to this period; you are actually Lieutenant Knight, a highly decorated soldier who lived in the 1970s. Because of a mysterious experiment, you have been catapulted two centuries into the future. Everything is new and complicated for you. Your world, the society you grew up in, is profoundly different from the one you are in now.”
Stellar Dream New Version 0.56 Winterlook

Stellar Dream tells a story about a colony ship set to find new worlds suitable for human colonization.
Scouts were send to three most suitable candidates but communication with them has been lost.
The player’s task is to bring the scouts home,
find a suitable home for the colony and establish diplomatic relations with alien life forms.
Light-Space Love New Version 0.47 Halftilt

The year is 8643. As Captain Linessa Star, Commander of Repopulation Colony: Deep Six Nine, you find yourself thrust into a galaxy teetering on the brink of ecological collapse. The Federation, dedicated to preserving biodiversity across the cosmos, entrusted its colonies with a vital mission – to assist endangered Xeno species through a unique form of genetic collaboration. This involves fostering relationships that transcend biological barriers, leading to interspecies reproduction facilitated by advanced genetic technology. Your role as Captain is paramount: forge bonds with diverse Xeno populations and recruit them to Deep Six Nine's breeding program. However, your return from a year-long mission has been marred by an unsettling amnesia. Fragments of memories remain elusive, leaving you with haunting questions about your past and the circumstances surrounding your memory loss. Deep Six Nine, once a beacon of hope, now teeters on the precipice of disarray. Your colony's future hinges on your ability to unravel the mysteries plaguing your mind and restore order to its fractured operations. Embark on a journey through uncharted galaxies, navigating treacherous interstellar routes and encountering captivating Xeno cultures. Each encounter holds the potential for both scientific advancement and personal revelation. Will you succeed in piecing together the fragments of your past and guiding Deep Six Nine towards a brighter future?
Paracosmic Reality New Version 1.8.0 Main Jiggly Stone Studios

You awaken to an unexpected surprise: a mysterious letter hinting at inherited property. Little do you know, this newfound possession will irrevocably alter your life's trajectory.Embark on a journey to decipher the enigma behind this bequest and its profound implications for your future. Along the way, endearing companions will join your quest, adding warmth and lightheartedness to this captivating unraveling of secrets.
Galaxy of Scum The Game New Version 1.4.1 Galaxy of Scum Cryo_hub

Stepping into the role of Astra, you find yourself thrust into a world of thrilling danger and seductive possibilities. As a cunning strategist, you must outmaneuver ruthless pirates, forge alliances with powerful Crime Lords, and navigate a web of intrigue where every decision carries weight—and could lead to exhilarating encounters, depending on your choices.
Lust Survivor New Version 0.8 Moccasin's Mirror

Seven girls crashland on an uninhabited planet after an accident, they will have to survive until help arrives and learn how to deal with each other. Hours ago the girls were just students from different careers on route to a far away research site for different reasons. Some girls know each other but nobody was remotely prepared for the situation. The group needs to start getting along and doing something if they want to get rescued or at least survive.