Best Linux Free Science Fiction Games

Explore, fight, and build your empire in a massive sci‑fi sandbox.

An innovative hybrid of first-person shooter and real-time strategy gameplay set in a fantasy sci-fi world.

Twenty new horror‑filled levels expand Doom II’s classic mayhem

Delve deep, retrieve the Amulet of Yendor, and die gloriously.

A far‑future text adventure where your typed commands shape the cosmos.

A free, horror‑filled expansion that deepens Doom 3’s dark sci‑fi nightmare

Fast, physics‑driven multiplayer deathmatch in the Half‑Life 2 universe

Political intrigue in a medieval sci‑fi palace

Classless sci‑fantasy MMO with open world crafting and dynamic events.

Old-school scrolling shooter homage to 90s Amiga action.

Explore, evolve, and dominate an ever‑changing sandbox universe.

Fast-paced, retro shooter tribute to classic arena combat

A philosophical action quest through RAM’s garbage, seeking peace before deletion.

A whimsical point-and-click adventure to rescue a space gnome's dog

A free tech demo that introduced HDR lighting to the Source engine.

Fast‑paced, free‑to‑play arena shooter with crisp movement

Fast-paced, quake-like arena shooter for Linux, PC, and Mac.