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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Pixelships
shooter / shoot 'em up
Kris Asick

PlanetSide 2
action / MMOFPS
Daybreak Games

Strange Adventures in Infinite Space
simulation / rogue-lite
Digital Eel

Titans of Steel: Warring Suns
strategy / wargame
Matrix Games

TraumaRL
RPG / roguelike
flend

UFO: Alien Invasion
strategy / turn-based tactics
UFO: Alien Invasion Team

Verminian Trap
action / arcade
Locomalito

Xenophage: Alien Bloodsport
action / fighting games
Apogee Software

Maniac Mansion Mania - Episode 1: Sibling love
adventure / point & click
LucasFan Games

Fallout Shelter
simulation / management
Bethesda Game Studios

Captain Comic 2: Fractured Reality
platformer / metroidvania
Michael A. Denio

Distorted Travesty 1
platformer
ZephyrBurst

GearHead 2
RPG / roguelike
Joseph Hewitt

It Came from the Desert
adventure / action-adventure
Cinemaware

Noitu Love
platformer
Konjak

Vega Strike
simulation / space combat
The Vega Strike Team

Decker
RPG / roguelike
Shawn Overcash

Pioneer
simulation / space exploration
Pioneer developers

Star Wars: The Battle of Yavin
shooter / space combat
Bruno R. Marcos

Chicken Invaders Universe
shooter / shoot 'em up
InterAction Studios

Endgame: Singularity
simulation
Endgame: Singularity team