1,797 Action · Online co-op games your group can play together online, including Sven Co-op, The Pirate: Caribbean Hunt, and Serious Sam VR: The First Encounter.
All games: 24
Fight through connected Half-Life campaigns and a wide range of community maps with friends online or over LAN. Revive teammates, solve map-built puzzles, and keep your group moving together.
Hail to the Captain! Sail into the heart of the Caribbean in the Age of Piracy - the time of black flags and white skulls, blue waves and golden opportunities. Hoist the Jolly Roger and grab the steering wheel to sail through battles and raids, ransoms and treasures, to become the Crimson King of the Antilles!
Take on a 15-level arcade shooter campaign with up to 16 online players. Serious Sam VR pairs huge enemy waves and dual-wielded weapons with configurable co-op rules, but every player needs a VR setup.
Based on the community award-winning Doom2 mod with the same name by the same creator, UNLOVED is reimagined in the Unreal Engine 4 to bring forth the unspeakable terror in new ways. Play coop with your friends, increase your skills, mod your weapons and face the horror that this unearthly place holds...
Tom Clancy's Rainbow Six Siege is an elite, tactical team-based shooter where superior planning and execution triumph.
The Old World is yours to command. Lead Legendary Lords in a combination of turn-based campaign and magically charged, strategic real-time battles, and decide the fate of your chosen race in a fight against Chaos.
An international hit anime "Attack on Titan" has come to Steam®! Battle is joined between the man-eating Titans and Eren and his companions. Experience the illusion of being in the anime, and controlling the flow of the story. The story from the anime, with a few original twists, is yours to experience!
Force of Nature is a Sandbox game that combines Action, Adventure, RPG, Strategy and Management genres
This Co-op Shooter , has Day and Night levels, multiple maps, players will take on 25 enemy types and numerous bosses, like Gargantuan Monsters and Minibosses every 10 days as you explore, shoot and run for your life against the onslaught of porcine monstrosities.
DMO is MMO featuring the ever-popular Digimon franchise. This long awaited game will feature a deeper RPG experience, enhanced graphics and adrenaline-pumping real-time combat. Both new and long-time Digimon fans can now immerse themselves into this new epic adventure with their very own Digimons.
HELLDIVERS™ is a hardcore, cooperative, twin stick shooter. As part of the elite unit called the HELLDIVERS, players must work together to protect SUPER EARTH and defeat the enemies of mankind in an intense intergalactic war.
Broforce is an action-packed side-scrolling run ‘n’ gun ode to freedom, putting you in control of an under-funded, overpowered paramilitary organization dealing exclusively in excessive force.
Infinite Warfare delivers three unique game modes: Campaign, Multiplayer, and Zombies.
RWBY: GRIMM ECLIPSE is a 4 player, online co-op, hack and slash game based upon Rooster Teeth’s international hit series RWBY.
Welcome to the zombie apocalypse experience of a lifetime – more beautiful than ever. Caught in an epic zombie outbreak on the tropical island of Banoi, your only thought is: Survive!
Move or Die is an absurdly fast-paced 4-player local and online party game where the mechanics change every 20 seconds! It's THE friendship-ruining game.
Tanki Online is the free-to-play MMO-shooter with real-time PvP-battles. Throw yourself into furious tank battles shoulder to shoulder with other living players and master your skills – destroy enemy tanks, customize your futuristic armored vehicle and compete with tankers from all over the world.
Dead or Alive? Make up your mind, stranger. We don’t like that undead business here in Louisiana…Survive solo or with friends as you look to fulfill your basic needs of food, water and shelter, crafting your own tools and weapons while you secure your camp and face flesh hungry zombies.
A tactical open world third-person shooter set in New York after a deadly pandemic. Team up or go solo to restore order against deadly factions, secure loot, and conquer high-risk endgame challenges.
Barony is the premier first-person roguelike with cooperative play! Adventure alone, or gather a party with iconic and unusual RPG classes to face off against the brutal dungeons. Test your resourcefulness, wits, and friendships, on your quest to lift the evil lich's curse!
One fish, four lemurs. Online arcade battles between lemurs on dinghies. Grab your paddles, hop in a boat, and beat up anyone who tries to snatch your precious fish. And don’t miss the chance to fishslap a friend or three!
First-person action survival game set in a post-apocalyptic open world overrun by flesh-hungry zombies. Roam a city devastated by a mysterious virus epidemic. Scavenge for supplies, craft weapons, and face hordes of the infected.
Wage war across entire solar systems with massive armies at your command. Annihilate enemy forces with world-shattering TITAN-class units, and demolish planets with massive super weapons!