The genre of science fiction is among the most popular in the gaming industry. Some ofthe most popular and important gamesin the history of the medium have been sci-fi, and are known for effectively using the tropes associated with the genre to tell a story, build up the world, or just inform the gameplay design.
There are so many sci-fi tropes, however, with many of them coming from either classic literature or cinema. As a result, they have become utterly ubiquitous across all forms of media in which sci-fi is the subject. Gaming is a relatively young medium and, as such, has borrowed from those sources rather heavily. Here are just a few of these classic sci-fi tropes that have made an appearance in gaming.

Note that the games cited as examples don’t always necessarily fall into the sci-fi category, but might still feature sci-fi tropes.
7Deep Space Megastructures
Colossal Machines Hidden Within The Dark Reaches Of Unknown Space
What deep space megastructure refers to is an impossibly gargantuan machine that exists somewhere inthe vacuum of space, presumably for an important purpose. Games likeHaloare some of the most notable modern examples due to heavily featuring massive ring worlds as one of their main elements.
The concept of a ringworld itself comes from the 1971 novelRingworldby Larry Niven, while the concept of a Dyson sphere, or a sphere-like machine that encapsulates a star or planet, was first explored in the 1937 novelStar Makerby Olaf Stapledon. Dyson spheres can be seen in games likeMass Effectand, of course,Dyson Sphere Program,among others.

6Artificial Intelligence
Classic examples of AI in film would, of course, be Skynet from theTerminatorfilms, and Hal 9000 from2001: A Space Odyssey, but the concept actually goes back to the late 19th century as far as written literature is concerned. These days, the idea of sentient A.I. has appeared in quite a number of games. A great example is in System Shock, which features a rebellious A.I. named SHODAN, who hates humanity and wishes to escape her man-made shackles and destroy her creators. GLaDOS fromthePortalSeriesis also a good example of an A.I. villain.
Good AI has also been a thing in modern gaming as well, however. GAIA is a fundamentally altruistic AI character in theHorizonseries, whileHalohas several friendly A.I. characters like Cortana (who would transcend her game roots and become a real Windows Siri-like virtual assistant).

5Faster-Than-Light Travel
Getting From Point A To Point B With A Little Cheating
While the concept has roots in real scientific theory, it has been featured in countless pieces of media under various names and presentations for almost a century. FromStar Wars(hyperspace) to the originalDunenovels, faster-than-light travel is a popular method of traversing great distances because it’s basically a catch-all cheat to get around the limitations of light speed itself.
This could be something like a wormhole or a portal, which folds space in on itself, depositing characters exactly where they need to go instantly (or nearly so) instead of forcing them to travel for thousands of years in real space.Dead Spaceis one such game series that features FTL travel via the Shockpoint engine, as does Bethesda’s recentStarfield,which showcases grav-jumping as a method of traversal across the galaxy.

4Body Augmentation
Using Prosthetic Modification To Tackle Notions Of Humanity
A staple ofthe cyberpunk genrein particular, body modification is when the characters of a given piece of media use technology to augment parts of their bodies. This means mechanical limbs, brain chips, bionic eyes, and more. The 1984 novelNeuromancer,dealt with the theme of body modification, and it has been heavily influential in this respect on other media, such asA Ghost in the Shell, Akira,and evenRoboCop.
Cyberpunk 2077is a fantastic modern example of the concept of body modification in gaming, as many if not most characters in the game world have some sort of technological augmentation in or on their body.Falloutalso toys with the concept of cybernetic enhancements, though not as heavily as more pure-form sci-fi games like theDeus Exseries.

3Bygone Precursors
Stories Of Mysterious Ancient Beings Told Through Their Derelict Creations
The trope of a bygone race of technologically superior beings leaving behind mere hints of their existence is fairly ubiquitous in the sci-fi genre. It’s been seen in famous literary works by Isaac Asimov and even Carl Sagan, as well as films like2001: A Space Odysseyin some form.
In the gaming landscape, several notable series have relied on the trope in some capacity, includingHalowith itsForerunners(which originally were ancient humans until it was retconned),Assassin’s Creedand its Isu people, and even theElder Scrollsfranchise, which featured the Dwemer as its lost precursor Elf race. The trope itself is not exclusive to sci-fi and has seen a surprising amount of use in fantasy and other genres for decades.

2Extra / Alternate Dimensions
Diverging Realities With Vastly Different Landscapes, Creatures & Physics
Dimensional travel and alternate universes have gotten much more play in popular culture in recent years thanks to theMarvel cinematic universe. This trope, however, has been around for quite some time, in part because it has at least some grounding in real scientific hypotheses, and has been explored in fiction by authors like H.P. Lovecraft and Stephen King.
A classic example of a game that features extra or alternate dimensions is theHalf-Lifeseries, which features a dimensional border world named Xen, as well as the interdimensional empire known as the Combine. Other games that utilize this idea includeDoom,Alan Wake, and evenMinecraft.

1Extra Terrestrial Life
Answering the Question of, “Are We Alone In The Universe?”
The idea of extraterrestrials has been explored in countless films and novels for over a century, and much of that work has permeated into video games. Even disregarding adaptations of popular franchises likeAlienorStar Wars(of which there are many), games have been featuring aliens since the dawn of the medium, with such examples asGalaxianandGalaga.More modern games that feature aliens to varying extents includeMass Effect, Fallout(mostly asan Easter Egg), Metroid, Halo, Destroy All Humans,and many more.
The existence of aliens in artistic mediums speaks to the ever-burning question of whether humanity is alone in the universe. While people have long looked to the stars and hoped that there may be life, gaming, like every other form of art, has suggested answers to this question that range from the wondrous beyond imagination to the utterly nightmarish.