Best free "science fiction" games
Play games defined by keyword "science fiction" sorted by user rating.
GAME SETTING – Deep-space exploration, mech battles, cyberpunk romances, UFO invasions—if it even faintly smells like science fiction, it’s probably been turned into a video game. Free games are no exception. From Star Trek to Star Wars, indie and freeware creators keep dipping into the endless well of sci-fi for inspiration.
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Action Taimanin
RPG
LiLith
2020NSFW 
Hokuto No Ken Sensei no michi - The Way of Masters
action / fighting games
Hokuto Project
2020 
Time Clickers
shooter / idle clicker
Proton Studio
2015 
Cyberpunk Dreams
RPG
Late Night Games
2021 
Infested
adventure / point & click
GrahfMetal
2016 
Marathon 2: Durandal
shooter / first-person shooter
Bungie Software
1995 
Mars Tomorrow
strategy / MMORTS
Game Fabrik
- 
S.D.I.
action
Cinemaware
1986 
Star Fleet II: Krellan Commander
strategy / space combat
Interstel
1989 
Verminest
shooter / shoot 'em up
Locomalito
2012 
Halo Zero
shooter / run and gun
Biohazard software
2008 
Battlestar Galactica Online
shooter / MMOFPS
Bigpoint Games
2011 
Major Stryker
shooter / shoot 'em up
Apogee
1987 
Star Wars Combine
RPG / MMORPG
SWC Programming Team
1998 
The Empire Strikes Back
shooter / space combat
MinionSoft
2008 
Void Pyramid
RPG / old school RPG
A. Hagen
2016 
Maniac Mansion Deluxe
adventure / point & click
LucasFan Games
2004 
Empire Universe 3
strategy / MMORTS
Looki Publishing
- 
Microsoft Allegiance
simulation / space combat
Microsoft Game Studios
2000 
The Wastes
RPG / roguelike
Huw2k8
2015 
Transport Defender
shooter / idle clicker
Coconut Shavers
2017