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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Alien Swarm
shooter / run and gun
Valve

Nitronic Rush
action / racing
Team Nitronic

Blossoms Bloom Brightest
adventure / visual novel
Reine Works

Dreamweb
adventure / point & click
Creative Reality

onEscapee
platformer / run and gun
Invictus Games, Ltd.

Space Quest 2: Vohaul's Revenge VGA
adventure / point & click
Infamous Adventures

StarCraft II
strategy / real-time strategy
Blizzard

Trascendence
simulation / space exploration
Kronosaur Productions

Turbo Raketti
shooter / shoot 'em up
Heikki Kosola

Abuse
platformer / run and gun
Crack dot Com

Alien Assault
strategy / turn-based tactics
Teardown

Ark 22
adventure / JRPG
HiVE

The New Adventures of Zak McKracken
adventure / point & click
LucasFan Games

Adventures in the Galaxy of Fantabulous Wonderment
adventure / point & click
Ben 'Yahtzee' Croshaw

Iji
platformer / metroidvania
Daniel Remar

Armagetron Advanced
action / racing
ArmagetronAd.org

Command & Conquer
strategy / real-time strategy
Virgin Interactive

Endless Sky
action / space exploration
Michael Zahniser

FreeOrion
strategy / 4X
FreeOrion project

Mutant Factions
shooter
Nik Nak Studios

Noctis
simulation / space exploration
Alessandro Ghignola