Best Free Sci-Fi Games for PC and Browser in 2025!

Fortnite
Play Fortnite in a totally new way, in Fortnite: Battle Royale, the free-to-play spinoff of Epic Games' builder/shooter. Like other classic BR games, you'll be dropped into the world and forced to scavenge and survive.

Marvel Rivals
Marvel IP and a hero-shooter, could there be a better free-to-play combo?

AirMech
AirMech is a 3D sci-fi RTS by Carbon Games, available in the browser (Chrome) and through Steam With DotA-style gameplay players control a transforming mech, that can take flight at a moments notice in this strategy based game. Combat on the ground or switch to air to fly around and pick up units to transport.

Halo Infinite (Multiplayer)
Step into the boots of a fresh Spartan and fight for galactic supremacy in free-to-play Halo Infinite Multiplayer

Tower of Fantasy
Tower of Fantasy brings the MMORPG experience to PC and mobile with a F2P, splashy, anime-esque style.

Warface
Warface is a free to play 3D military MMOFPS developed by Crytek (best known for developing Far Cry, Crysis and CryENGINE) with next gen visuals, AI and physics powered by CryENGINE3, the same game engine behind Crysis 2. Warface provides gamers with a constantly updated extensive PVE universe full of dramatic multiplayer co-op missions that reward teamwork and individual skill and a full set of class based PVP for unmatched competitive play.

Pocket Starships
Blast off into adventure in Pocket Starships, a free-to-play browser MMORPG with fast-paced starship-fighting action! Play with your friends or go it alone by taking quests from NPCs.

Crossout
Trick out your ride and take to the post-apocalyptic roads for battle in Crossout, the free-to-play vehicular combat game from Gaijin Entertainment! Featuring a vehicle design system with endless customization and fast-paced, armor-crunching combat, Crossout offers high-octane excitement in brief and explosive matches.

Star Trek Online
Star Trek Online (STO) is a free to play 3D Sci-Fi MMORPG based on the popular Star Trek series. In this massively multiplayer online game from Cryptic Studios, players can pioneer their own destiny as Captain of a Federation starship or they can become a Klingon Warlord and expand the Empire to the far reaches of the galaxy.

Mars Tomorrow
Explore the Red Planet and save humanity in Mars Tomorrow, a free-to-play browser simulation game from Gamefabrik and Bytro Labs.

Warframe
Warframe is a free to play sci-fi co-op TPS (3rd-person shooter) being developed by Digital Extremes, the makers of The Darkness 2. As a race on the brink of extinction, players wield powerful suits the Tenno called warframes.

The First Descendant
Push back against the Vulgus with your Descendant of choice in this free-to-play PvE-only looter-shooter.

Dark Orbit Reloaded
Take part in huge intergalactic battles and take on the whole galaxy in DarkOrbit, the free-to-play browser-based space combat MMO from Bigpoint -- now in 3-D! Choose your faction and your ship, each with their own strengths, and take off into adventure!

Overwatch 2
Big changes come to the Overwatch formula in this sequel...and so does PvE content, eventually.

Valorant
Valorant is Riot Games' free-to-play competitive 5v5 tactical shooter, where you'll need strong gunplay and timely use of abilities to come out on top. Choose your character and participate in matches up to 25 rounds long, taking turns as attackers and defenders.

Closers
In Closers, a free-to-play fighting MMORPG, horrific creatures are springing from mysterious dimensional gates all around New Seoul, and it's up to you to stop them! Play as one of several psychic warriors, each with their own unique backstory and special abilities, and reclaim Korea!

Astro Empires
Explore the farthest reaches of space in Cybertopia Studios’ Astro Empires, a free to play text-based space strategy MMO that gives you something you’ve always dreamed of: the chance to build your own galaxy-spanning empire among the stars. As you start with your own planet in the farthest flung regions of unknown space in Astro Empires, you will learn to gather materials and develop new technologies to turn your previously unnoticed rock into a mighty empire befitting a galactic emperor.

Return Alive
KOG Games tries their hand at a Top-down Tactical Shooter Game for the first time.

Destiny 2
Embark on a heroic quest to save humanity in Bungie's epic sci-fi MMO shooter Destiny 2, now free-to-play. Experience a wealth of content as a stalwart Titan, mysterious Warlock, or crafty Hunter, battling the enemies of humanity across the solar system.

Phantasy Star Online 2
Phantasy Star Online 2 is a free to play 3D MMORPG published by SEGA. Based on the original Dreamcast and Gamecube series, Phantasy Star Online 2 offers players the chance to visit detailed worlds and fight hundreds of interesting enemies.

SoulWorker
Put your soul to work in SoulWorker, the free-to-play action MMORPG from VALOFE that uses your very soul as a weapon! Demons from the void are trying to wipe out all of humanity, and it's up to a small band of fighters to hold them off.

Star Trek: Alien Domain
Star Trek: Alien Domain is a free-to-play sci-fi strategy game played in a web browser. The game features a new Star Trek story, dozens of new starships and alien species.

Spacelords
Experience an epic sci-fi story as either rugged Raiders or invading Antagonists in Spacelords from MercurySteam! Formerly known as Raiders of the Broken Planet, Spacelords is a rework of the game, with all the action and cinematic story of the original, in free-to-play form.

Ironsight
Ironsight is a free-to-play shooter set in the 2020s, when two factions fight over the last of the planet's dwindling resources. Built from the ground up in the Iron Engine, Ironsight offers top-notch visuals and dynamic battlefields.

MechWarrior Online
MechWarrior Online is a free to play 3D simulation style multiplayer FPS mech game that captures the feeling of piloting a gigantic BattleMech. Players take control of one of a variety of towering Mechs which weight dozens of tons.

GetAmped 2
GetAmped 2 is a free fighting MMO game that follows the work made on Splash Fighters. In this game players enter the city of Wingdom and choose a fighter from five different classes.

Phantasy Star Online 2 New Genesis
Defend the Planet Halpha against the threat of the DOLLS in F2P sci-fi MMORPG Phantasy Star Online 2: New Genesis! PSO2:NG is a remastered version of the original PSO2, with stunning new graphics and gameplay features.

Skyforge
Skyforge is a free-to-play sci-fi MMORPG from the Allods Team, Obsidian Entertainment, and My.com where players will become gods to battle invading forces from space as well as other players. In Skyforge, players will progress towards becoming gods.

Super Mecha Champions
Jump into your mech and duke it out with the rest of the world in Super Mecha Champions, a free-to-play battle royale from NetEase. Your battlefield is the futuristic manga-inspired Alpha City, where you'll choose your ace pilot, select one of 10 mecha, customize it to your liking, and dash into furious combat!

PlanetSide 2
Planetside 2 is free to play open world persistent MMOFPS published by Sony Entertainment Online. In Planetside 2 players fight in epic large scale battles across a variety of landscapes during the day and night.

S4 league
S4 League is a great free MMO game that perfectly blends nonstop shooter action with inspired anime visuals. It’s a stylish third person shooter with a fantastic and colorful anime attitude that is both terrific to look at and play.

Project Apidom
Let's mash up a few different genres of multiplayer games and see what we get!