Free "science fiction" games
Play games defined by keyword "science fiction" sorted alphabetically by title.
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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Amiga
Amstrad CPC
Android
Apple II
Atari ST
Commodore 64
DOS
Free BSD
Linux
Mac OSX
Nintendo Switch
PlayStation 2
PlayStation 4
Sega Genesis
UNIX
Windows
Xbox
Xbox One
browser
iOS
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Battlecruiser Millennium
simulation / space exploration
3000AD
Battleships forever
strategy / space combat
Sean "th15" Chan
Battlestar Galactica Online
shooter / MMOFPS
Bigpoint Games
BattleZone
action
Activision
Begin: a Tactical Starship Simulation
simulation / space combat
Starfleet Project team
Beneath a Steel Sky
adventure / point & click
Revolution Software
Bio Menace
platformer / run and gun
3D Realms
Black Mesa
shooter / first-person shooter
Crowbar Collective
Bloodmasters
shooter / shoot 'em up
Pascal van der Heiden
Blossoms Bloom Brightest
adventure / visual novel
Reine Works
Boppin'
puzzle / tile-matching
Accursed Toys
Bounty Hunter SX
shooter / arcade
S64 Games
Captain Comic 2: Fractured Reality
platformer / metroidvania
Michael A. Denio
Carpe Universum
shooter / shoot 'em up
Wyrdysm Games
Caves of Qud (free version)
RPG / roguelike
Freehold Games
Chicken Invaders
shooter / shoot 'em up
InterAction Studios
Chicken Invaders 2: The Next Wave
shooter / shoot 'em up
InterAction Studios
Chicken Invaders Universe
shooter / shoot 'em up
InterAction Studios
Command & Conquer
strategy / real-time strategy
Virgin Interactive
Computer, Open That Door!
puzzle
Paul Lawitzki and Ralf Zimmer
Continuum
shooter / shoot 'em up
Virgin Interactive