オンラインでみんなと遊べるアクション（Sci-fi）ゲーム521本。ENDLESS Dungeon™ - Definitive Edition、SCP: Labrat、LEGO® Star Wars™: The Skywalker Sagaなど。
すべてのゲーム: 24
ENDLESS Dungeon™ is a Rogue-lite Tactical Action game, set in the award-winning ENDLESS Universe™. Recruit a team of shipwrecked heroes, plunge into a long-abandoned space station, and protect your crystal against never-ending waves of monsters… or die trying, get reloaded, and try again.
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.
Play through all nine Skywalker saga films in a game unlike any other. With over 300 playable characters, over 100 vehicles, and 23 planets to explore, a galaxy far, far away has never been more fun! *Includes classic Obi-Wan Kenobi playable character
Retrowave Action Roguelike featuring tough agents battling crime to the electrifying music of artists like Droid Bishop, Timecop1983, and more! Choose your agent and dive into hardcore action against enemies and bosses, utilizing a vast arsenal and special abilities that will define your playstyle
A fiercely formidable sci-fi survival game, set on a hostile alien world that wants you dead! Alone, or with a crew, do you have what it takes to survive?
Tom Clancy's Rainbow Six® Extraction is a tactical, co-op, PvE first-person shooter where you and your squad face an evolving alien threat. Teamwork, tactics, and flawless execution are key to your survival.
Crypto is back with a license to probe. The alien invader returns, groovier than ever. Experience the swinging ‘60s in all its chemical-induced glory and take revenge on the KGB for blowing up your mothership. You’ll have to form alliances with members of the very species you came to enslave.
Guardians Frontline is a sci-fi VR shooter that makes you a soldier and a commander. Fight off enemies and build bases in a single-player and co-op campaign, plus PvP game modes with full cross-play support.
Step into the Arena. Compete against players from around the world in this fast-paced shooter that combines the dark mythos of the original Quake with the skill-based competition of Quake III Arena. Become a Champion.
EZ2ON REBOOT : R – The latest entry in the beloved rhythm-action franchise is now released on Steam! Revisit the huge collection of classics with remastered audiovisual. Catch up with the freshest new songs and experiences.
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.
LASERS is a brutally hard multiplayer game about surviving deadly laser mazes. Only one player can win. Will it be you?
Crab Game is a First-Person Multiplayer game where you play through several different minigames based on children's games, until only one player stands victorious.
Embark together on your fantasy adventure! Set hundreds of years in the future on the distant planet of Aida, the shared open-world RPG, anime-infused sci-fi adventure Tower of Fantasy now is officially available on Steam.
Serious Sam: Siberian Mayhem is a new stand-alone expansion to the world of the classic FPS series. Join the fight against Notorious Mental on a journey through the wild lands of Russia, and find your way through this lost chapter of Sam Stone's adventures.
A terrifying online horror game where one player becomes an impostor monster. Disguise, hunt, and destroy your friends — or work together to survive. Mimicry is a fast-paced, multiplayer fun game full of deception, fear, and chaos.
Use Nukes, Electricity, Heat Rays and powerful Minions in this wave-based first person shooter providing endless hours of Ghost-slaying entertainment, solo or Co-Op. Only Ghosts stand in the way of your invasion of Earth.
S.B.T.F. is a very hard arcade-style / rogue-like / perma-death first person shooter. You play as Marines who must brave dark, claustrophobic and terrifyingly intense Space Beast infested spacecraft in order to extract critical data and lucrative upgrades. Can you make it out alive?
Craft. Shoot. Die. Repeat. Forge absurdly powerful guns and fight through the belly of a metal alien monstrosity in this VR FPS roguelite follow up to MOTHERGUNSHIP. Wanna build a rocket-firing-shotgun or a toxic spike-ball-launcher? Unleash your inner mad scientist, then take on the MOTHERGUNSHIP.
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.
SYNTHETIK 2 is a unrelenting tactical-shooter rogue-lite. Play alone or with friends. Loot powerful tech. Experience the next level in gun-play. Upgrade your androids to rival the machine gods!
Hidden Deep is an atmospheric sci-fi action game heavily inspired by Aliens, The Thing, and Half-Life. Explore, climb, swim, scan, blast and shoot your way through dangerous missions in a huge sub oceanic mining and research facility. Fear the horrors that lurk below…
Aliens: Fireteam Elite is a cooperative third-person survival game set in the iconic Alien Universe. Battle through hordes of different types of Xenomorph, customize your character and gear, and level-up as you try to contain this ever-growing threat.
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.