Top Free Sci-Fi Games for Browser In 2025!

8 free-to-play web browser Sci-Fi games found in our games list!

FREE

Genre/Tag: Sci-Fi

FREE

A browser-based 3D space-combat MMO with a massive playerbase!

Shooter

FREE

A Roguelike MMORPG with MetroidVania-style platformer gameplay! Castlevania and Metroid fans will love this game!

MMORPG

FREE

A free to play browser based 2D strategy MMO set in the Stark Trek universe.

Strategy

FREE

A free-to-play browser MMO strategy game that puts you in command of a rapidly growing city on a dangerous alien world.

Strategy

FREE

A free-to-play cross-platform space combat MMO from SPYR games.

Strategy

FREE

A free-to-play 3D MMO with cowboys, dinosaurs, and laser guns.

MMORPG

FREE

A free to play 3d browser based tank game with fast-paced tactical battles!

Shooter

FREE

A text-based sci-fi strategy and diplomacy MMO Game in a persistent universe.

Strategy