オンラインでみんなと遊べるアドベンチャー（Co-op）ゲーム1,004本。UnderMine 2、Wires And Whiskers、Warhammer 40,000: Space Marine 2など。
すべてのゲーム: 24
Delve into the dangerous, ever-shifting labyrinth that is the Undermine. Discover, craft, and combine hundreds of unique items. Pair them with an ever-expanding roster of distinct playable characters for a new run every time! Grab a partner and uncover UnderMine 2's secrets together in local co-op.
Wires and Whiskers is a local co-op action-puzzle game where two players control a lab-engineered gerbil and its magnetic exosuit. Work together to fight mutated enemies, solve magnetic puzzles, and survive in a ruined, post-apocalyptic trench world.
Embody the superhuman skill and brutality of a Space Marine. Unleash deadly abilities and devastating weaponry to obliterate the relentless Tyranid swarms. Defend the Imperium in spectacular third-person action in solo or multiplayer modes.
Marvel Rivals is a Super Hero Team-Based PVP Shooter! Assemble an all-star Marvel squad, devise countless strategies by combining powers to form unique Team-Up skills and fight in destructible, ever-changing battlefields across the continually evolving Marvel universe!
You are lost in the Bermuda Void, where the ocean is endless and dry land precious. Craft your Ship-in-a-Bottle, then experience survival on the high seas. Sail for new land, build camps, hunt for treasures, trade for goods - then defend your ship from dreaded pirates stalking this strange realm!
Unveil a heartfelt story of family, dinosaurs, and UFOs! Craft, upgrade, and survive in a realm of primeval predators, savage tribes and... ancient aliens. Rise from a humble cave dweller to the planet’s last hope — alone or in local co-op. Welcome to the dinovania!
Void Crew is a Chaotic, Co-op Roguelite game for 1 to 6 players: Outfit your spaceship and crew for thrilling quests, brave fierce enemies in Space Battles... and try not to panic!
Soar the skies in Aloft, the co-op sandbox survival game set in a world of floating islands. Build any island into a skyship, your home in the clouds. Find lost knowledge, cure the fungal corruption, and brave the hurricane to restore the ecosystem.
Get ready to explore, farm, fish, mine, craft, and raise magical Lumas as you solve puzzles and embark on quests across Luma Island. Play solo, or team up with friends in 1-4 player online co-op. Choose relaxing Cozy, challenging Adventure, or epic Hero mode to match your mood and playstyle.
Live your best squirrel life. Explore, gather, craft, and build incredible treehouses in acres of beautiful parkland. Scurry across lawns, up trees, and leap limb to limb solo, or up to four friends can play together in co-op. Endless summer days of adventure await.
Endless Alice is a third-person action-adventure game combining Roguelite elements, anime aesthetics, and endless possibilities. Choose characters with unique combat styles and embark on adventures! Play solo or with friends in cooperative challenges for up to 4 players!
Offering unparalleled sniping mechanics, stealth and tactical third-person combat, Sniper Elite: Resistance turns the attention of the award-winning series towards a hidden war, far from the front lines, deep within the heart of occupied France.
Get ready for a thrilling mix of genres: a cooperative, first-person, open-world fantasy tavern simulator, action, fishing, hunting, exploration, and completing fun and diverse quests. And, of course, COOKING! Play with friends, feed and quench the thirst of the entire world!
Zort is an action, adventure, and horror game that can be played with up to 4 people. Explore maps with your friends and have fun while escaping from various creatures. Experience a realistic horror experience with in-game voice chat with your friends!
Embark on a galactic journey in Cubic Odyssey, an open-world adventure where you explore vibrant planets, craft tools, build vehicles, and fight the Red Darkness. Uncover ancient mysteries, and shape a universe full of life, danger, and limitless possibilities!
Climb up from the depths of Hell. Scale various worlds solo or chained together with your friends in the 1-4 player platforming sensation.
The Gold River Project™ is a camping trip gone wrong in the Pacific Northwest. Explore, craft, build, and survive in this open-world experiment that traps you and up to 4 friends in this single player or co-op survival adventure game.
A space survival open world terraforming crafting game, designed for 1 to 10 players. Alter the ecosystem of an inhospitable planet to render it habitable for humanity. Survive, gather resources, and build your base. Then, generate oxygen, warmth, and pressure to create a brand new biosphere.
Ready to run a tavern with a Dragon companion? On this charming island, you can live out your tavern-keeping dreams. Along the way, you'll meet all kinds of guests, Encounter unicorns, battle Giant Elementals, and embrace adventures! Begin your journey as the Dragon Song calls!
An Open World Survival Shooter blending hardcore PVP and PVE action. Secure precious loot in safe zones or build your own fortress in the wild. With intense gunfights, stunning visuals, and performance smooth enough for any system, the challenge awaits!
Fantasy comes alive in this vast yet cozy free-to-play MMORPG! Choose between 4 classes and 8 subclasses, explore hundreds of locations, thousands of quests, dive into varied PvE and PvP modes, enter the unique vibrant world, and trade with other players. Play, explore, fight and be victorious!
Trade, quest, fight, or simply set sail and enjoy the ambiance in this charming open world naval RPG. Sequel to Tasharen's fan favorite game Windward released on Steam in 2015.
The LEGO® Harry Potter™: Collection brings LEGO® Harry Potter™: Years 1-4 and LEGO® Harry Potter™: Years 5-7 together in one game, now remastered with enhanced graphics.
TMNT Splintered Fate - Unleash the Turtles in a roguelike quest to rescue Splinter from the Foot Clan! Master ninja skills, unite in bodacious co-op gameplay, and conquer iconic NYC locales.