基本プレイ無料 · Sci-fi · Singleplayer：みんなで遊べるゲーム

Cyberfrags '69

Move fast and shoot fast in Cyberfrags '69. Double jump, wall-run, and blast your way to victory in intense PvP and Co-Op, or play as Cyber-Frank as he slaughters the Cyber-Nazis invading his home!

無料

Save patients with your rhythm mastery! Rhythm Doctor is a rhythm game where you heal patients by defibrillating in time to their heartbeats. Learn each patient's unique heartbeat and defeat boss viruses trying to sabotage your rhythm, all set to heart-pumping, soul-soothing music.

$19.99

Roadside Research

Roadside Research is a 1 to 4 player co-op gas station simulator. Except you’re aliens. And undercover. Do very human things like restocking shelves while preparing for the invasion. Just don’t get caught.

$14.99

Chrono CCG

Rewrite history in a free-to-play card battler built for competitors. Shift the Timeline to change the rules for both players, Immortalize your agents into their ultimate forms mid-match, and win deliberate, skill-first duels. Made by CCG champions, creators and community leaders.

無料

Madoka Magica Magia Exedra

Characters from the hit anime series "Puella Magi Madoka Magica" come together! Featuring an all-new story setting and characters from the original ideas of Gekidan Inu Curry (Doroinu), experience the action alongside Magical Girl memories in this battle RPG!

無料

Toaster Arena

Toaster Arena is a first person multiplayer arena shooter where players battle it out on different maps and game modes. Use Advanced movement to traverse obstacles and gain the advantage on the battlefield.

無料

Block Fortress 2

Choose a planet, build your fortress, and prepare for war. Arm yourself with powerful weapons, deploy troops, construct turrets, and defend your stronghold against relentless attacks. Team up with a friend or fight alone in this action packed block builder, where only the strongest survive.

$19.99

Mutants: Genesis

Mutants: Genesis is an online card game that you can play solo or with up to 3 players in PvE and PvP modes! Join the next generation of Psycogs and climb the ranks to establish yourself as Champion! Collect hundreds of mutants, fashion your own deck, cooperate with or fight other players!

無料

Relentless Expanse

Capture and upgrade planets, outsmart your enemies, and conquer the galaxy! Simple yet addicting, you can play alone or outsmart your friends in this 2D top-down space RTS. Completely free, no monetization, just fun!

無料

Classic Marathon Infinity

From the team that brought you Aleph One, the classic sci-fi FPS Marathon Infinity from Bungie on Mac revived for modern hardware by the fan community.

無料

Classic Marathon 2

From the team that brought you Aleph One, the classic sci-fi FPS Marathon 2: Durandal from Bungie on Mac revived for modern hardware by the fan community.

無料

Planet S

Planet S is a real-time strategy game where your goal is to colonize multiple planets in a solar system to advance your civilization, build a city and supply it to grow your faction.

無料

MetaBall - Multiplayer Basketball

Experience the thrill of Hoverboard Basketball! Team up or challenge players worldwide in fast-paced crossplay PvP matches. Master the ball, dribble, and outwit your opponents to score impressive goals— with no aim assist. Only skill and creativity matter. Grab your Hoverboard and dominate now!

無料

SCP: Labrat

You are a test subject in the underground SCP research facility. When a containment breach occurs, you must find your way out. Escape the SCPs, discover anomalous objects, and collect valuable resources along the way.

無料

Pixel Royale 3D

Action Packed Pixelated FPS! Run, Slide, and Wall-Jump your way through the battlefield! Play Team Deathmatch, Deathmatch, Duels, or Pixel Royale, where the last one standing wins! Compete in leaderboards to win exclusive items and rise to the top of the world! No Pay-To-Win. Forever.

無料

Assault Bots

Assault Bots is a fast-paced multiplayer robot shooter game. Create your robot, let it drive, walk, or fly, and battle other players online in this intense shooter. Game features multiple maps and game modes.

無料

Halo Infinite

From one of gaming's most iconic sagas, Halo is bigger than ever. Featuring an expansive open-world campaign and a dynamic free to play multiplayer experience.

無料

BLEACH Brave Souls

The world of mega-hit manga and anime BLEACH comes to Steam in this exciting 3D action game! Build a team using your favorite characters from the BLEACH universe!

無料

Warzone 2100

In the late 21st century, the world's civilizations are wiped out by a series of nuclear strikes, seemingly caused by a massive malfunction of the new NASDA (North American Strategic Defense Agency) strategic defense system.

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Chex Quest HD

Travel to the remote planet of Bazoik to free galactic citizens from the evil cereal-eating Flemoids! Venture deep into the caverns of Bazoik, using an array of "zorching" devices to send these nefarious foes back to their home dimension!

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Zero-K

With 100+ truly unique units, Zero-K is an RTS of freedom and creativity, tempered by a decade of refinement. Sculpt land into a castle and throw invaders off it with a Jugglenaut. Explore a massive campaign, solo or co-op. Hop online for epic 32 player battles or fast paced 1v1, on 100s of maps.

無料

AirMech

AirMech® Strike is a fast paced Action-RTS game that can be played solo, coop, or competitively online. Earn Kudos and Experience in battle and unlock a wide collection of AirMechs and Units while you practice the perfect strategy to emerge victorious!

無料

SAS: Zombie Assault 4

Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing.

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Prismata

A perfect-information strategy game inspired by RTS, deckbuilders, and board games. Choose from three distinct technology classes and outwit your foes by snowballing your starting resources into a powerful cybernetic army. ABSOLUTELY NO PAY-TO-WIN.

無料