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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The Lost Vikings
platformer / action puzzle
Interplay Productions
The New Adventures of Zak McKracken
adventure / point & click
LucasFan Games
The Ur-Quan Masters
strategy / space exploration
Toys For Bob
The Vacuum
adventure / point & click
David Proctor
The Wastes
RPG / roguelike
Huw2k8
Thrust
action / arcade
S64 Games
Time Clickers
shooter / idle clicker
Proton Studio
Titans of Steel: Warring Suns
strategy / wargame
Matrix Games
Traffic Department 2192
shooter / shoot 'em up
P Squared
Transport Defender
shooter / idle clicker
Coconut Shavers
Trascendence
simulation / space exploration
Kronosaur Productions
TraumaRL
RPG / roguelike
flend
Tremulous
shooter / first-person shooter
Dark Legion Development
Tribes 2
shooter / first-person shooter
Dynamix/Sierra On-Line
Turbo Raketti
shooter / shoot 'em up
Heikki Kosola
Tyrian 2000
shooter / shoot 'em up
Eclipse Productions
UFO 2000
strategy / turn-based tactics
Ufo 2000 Crew
UFO: Alien Invasion
strategy / turn-based tactics
UFO: Alien Invasion Team
Ultima Worlds of Adventure 2: Martian Dreams
RPG / old school RPG
Origin Systems
Universal Combat
simulation / space combat
3000AD
Vega Conflict
strategy / MMORTS
KIXEYE