Best free "science fiction" games
Play games defined by keyword "science fiction" sorted by user rating.
GAME SETTING - Exploration in deep space, mech battles, cyberpunk lovestories, UFO invasions. Every theme even remotely tied to science fiction has been implemented in a video game one way or another. Free games make no exception; from Star Trek to Star Wars, developers still draw much inspiration from sci-fi.
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Hyper Princess Pitch
shooter / shoot 'em up
Daniel Remar

Digital: A Love Story
adventure / visual novel
Christine Love

EVE Online
simulation / MMORPG
CCP Games

Ascii Sector
simulation / space exploration
Laserbrain Studios

Factorio
simulation
Wube Software

Star Wars: The Old Republic
RPG / MMORPG
BioWare

StarCraft II
strategy / real-time strategy
Blizzard

The Ur-Quan Masters
strategy / space exploration
Toys For Bob

Beneath a Steel Sky
adventure / point & click
Revolution Software

Hero Core
shooter / metroidvania
Daniel Remar

One Must Fall: 2097
action / fighting games
Diversions Entertainment

Doom RL
shooter / roguelike
Kornel Kisielewicz

Tyrian 2000
shooter / shoot 'em up
Eclipse Productions

Blossoms Bloom Brightest
adventure / visual novel
Reine Works

Warframe
shooter / MMOFPS
Digital Extremes

Prospector
simulation / space exploration
Matthias Mennel

Worlds of Ultima: The Savage Empire
RPG / old school RPG
Origin Systems

Distorted Travesty 2
platformer
ZephyrBurst

Hydorah
shooter / shoot 'em up
Locomalito

StarCraft Anthology
strategy / real-time strategy
Blizzard

The Lost Vikings
platformer / action puzzle
Interplay Productions

Hurrican
platformer / run and gun
Poke53280

Oolite
simulation / space exploration
Oolite dev team

You Have to Win the Game
platformer / metroidvania
Minor Key Games