The great part about science fiction (sci-fi) is that it lets people peak into a world that may or may not be true. Novels and movies let people witness it, but video games let players experience it. Obviously, some of the games that will be mentioned are way outside the realm of possibility, but it's still fun to ponder how much of the technology previewed in these games will one day be possible.

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The games mentioned are sci-fi in their settings and nature. Sci-fi stories don't always take place in the future, so not all of these games will, either. According to Britannica, Science fiction is "a form of fiction that deals principally the impact of actual or imagined science upon society or an individual." Well, all the games mentioned in the list live up to that statement.

10 Fallout: New Vegas

Fallout New Vegas Gunplay Against Robots

Fallout: New Vegas is the best post-apocalyptic game that intertwines an exciting narrative with strong character development and a good sense of world-building. Everything that a player runs into makes sense in the world that has been created.

The game immerses players by showing a world ravaged by nuclear war where bottle caps are currency. The game is a great RPG where side quests give players more knowledge of different vaults and the society that has come after the apocalypse. The graphics are a bit dated, but that doesn't detract from its setting.

9 Doom: Eternal

Chaingun Doom Eternal

Doom: Eternal is a fast-paced, action-heavy first-person shooter. This game is sci-fi fantasy as it takes place in the future, where demons have overtaken Earth. Doomguy, the main character, must use his arsenal of weapons to commit mass amounts of destruction on demon hordes.

This is not a typical sci-fi game as nothing is too heavily explained, and the game mainly relies on gameplay to keep players interested. The gameplay never feels out of place and does a fantastic job at keeping players engaged in the title.

8 StarCraft II

StarCraft II Gameplay

StarCraft II is a real-time strategy game that lets players collect resources and build giant armies that battle one another. The game has heavy sci-fi elements, as players can play three different races online. They can play as two alien-type races--the Zerg and Protoss--or the human-type race--the Terran.

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The lore is well-thought-out as it explains what's going on in the StarCraft world, giving players a broader look at the different races. The game has a steep learning curve, though it's worth exploring because of its incredible setting and brilliant story.

7 Mass Effect 2

Mass Effect 2 Cover Art

Mass Effect 2 gives players a large-scale sci-fi adventure. The game has interplanetary travel that feels purposeful as different planets have their own problems. A lot of the time, players can do side quests on planets that add to the game's narrative.

The narrative is simple in its premise, as it might seem like another alien invasion story, but the threat is intellectually presented to the player with course dialogue. The option to become whoever a player wants to be as Shepard (the main character) is done impeccably.

6 Subnautica

Subnautica Gameplay Under The Ocean

Subnautica won't have player roaming around deep space, but instead, the beautiful yet horrific depths of an alien ocean. The game takes place in the future, where the human race has gone out to colonize other planets. The plot of the game has changed drastically over its creation, but its survival elements remain the same.

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Players must go into the depths of this alien ocean in search of new materials that will help them on their quest. There's a lot to explore in this game as well as a lot of unique flora and fauna that can be examined to flesh out this world.

5 Dead Space 2

Dead Space 2

Dead Space 2 elaborates on the world that it created in the first game. Isaac has been captured by EarthGov and placed into a mental hospital as he's gone insane after the events of the first game. These events lead him to have valuable information implanted in his head from the cursed alien object he came upon. The game takes place in 2511 and has so many wacky sci-fi elements littered all over it.

The weaponry feels like it belongs to a future where Earth has ravaged the galaxy through excessive mining. The zombie alien hybrids, Necromorphs, are awesome but also terrifying to look at. Dead Space 2 is by far the best survival horror sci-fi game available.

4 Halo: Combat Evolved

Halo Combat Evolved Gameplay

Halo: Combat Evolved is part of what started a lot of the craze for first-person shooters that take place in the future. The game features a breathtaking story that takes the player and thrusts them into the role of the main character right away. The players crash-land onto a mysterious planet where most of the action takes place within the first 30 minutes of the game.

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The premise keeps players interested as they continue to learn more about the battle and the reasoning behind the ringed alien planet. The couch co-op of the game was also a blast that incentivized LAN parties at the time.

3 Portal 2

Portal 2 Robot Jumping Through Portals

Portal 2 is full of mystery as its world feels post-apocalyptic, but after learning the game's lore, players will find that is not the case. The game takes place in a very isolated futuristic situation that's specific to the game's main character.

It gives off a day-in-the-life type feel. That day-in-the-life of the main character just happens to take place while being trapped by a maniacal robot that keeps forcing her to do portal puzzles until she dies. It's the perfect sequel to the original.

2 Half-Life 2

Half Life 2 Gameplay Against A Helicopter

Half-Life 2 is not just a great sci-fi game, but it's undeniably one of the greatest games ever. The story is phenomenal as it offers a planet on which the main character made a large impact during the events of the first game. The areas feel like a futuristic Earth that's been completely overtaken by alien creatures.

The plot of the game intertwines well with its interactive future setting. Every part of this game brings in something new. It additionally revolutionized the way in which physics works in games. It's a must-try sci-fi adventure with a lot going on.

1 BioShock

Bioshock Protagonist Jake Fighting A Big Daddy

BioShock has to be one of the most spectacular sci-fi games ever created. This is due to the game's extensive lore with the underwater city and fascinating enemies. The game feels like the player is going through the setting of Brave New World by Aldous Huxley, but underwater.

It's a horrific view of a dark drug-addicted world that has been wholly dragged down and damaged. The twists are also some of the most out-of-pocket sci-fi-based twists to have ever appeared in gaming. The way in which gameplay works also fits in with the world that the players have to explore.

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