Best Online Co-Op Games on Steam
Unlike generic lists, our strategy game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated online co-op games. For those who prefer not to search, check out lists of the most played, top deals and best free to play Online Co-Op games on Steam.
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Dungeon Defenders
Create a hero from one of four classes to save Etheria in this 4-player coop Tower Defense Action-RPG. Includes Steam exclusive Portal gun & TF2 familiars!
Dead Rising 2: Off the Record
You are Frank West – photojournalist and original hero of the Dead Rising Willamette incident – taking center stage experiencing the re-imagined Fortune City outbreak.
Supreme Commander: Forged Alliance
The last days of man are at hand.. Two years after the Infinite War the once great warring nations now lie in ruins, and humanity’s hope for a brighter future is nothing but a bitter memory. A new, seemingly unstoppable enemy, supported by the zealots of The Order, now seeks to eradicate mankind: UEF, Aeon Loyalist, and Cybran alike.
Worms Ultimate Mayhem
Load your weapons and experience a whole new dimension in destructive turn-based cartoon action!
Warhammer 40,000: Space Marine - Anniversary Edition
In Warhammer 40,000 Space Marine you are Captain Titus, a Space Marine of the Ultramarines chapter and a seasoned veteran of countless battles.
E.Y.E: Divine Cybermancy
In a dark Cyberpunk world, you (and up to 3 friends) wage war against the all-powerful Federation in this Source-powered FPS/RPG.
F.E.A.R. 3
F.E.A.R. 3 delivers all the hallmarks that define the F.E.A.R. brand: terrifying paranormal experience, frenetic combat and a dramatic storyline.
Champions Online
Grab your cape and defend Millennium City in this comic book-style action MMORPG! Design your hero and costume from thousands of costume pieces, face super-villains like Dr. Destroyer, and create your own unique nemesis.
Spiral Knights
Join the ranks of the Spiral Knights. Stranded on an alien world, you must explore the ever-changing Clockworks beneath its surface.
Portal 2 - The Final Hours
Portal 2 draws from the award-winning formula of innovative gameplay, story, and music that earned the original Portal over 70 industry accolades and created a cult following. For more information on Portal 2 click here.
Sanctum
You think Tower Defense games are all about building? You thought wrong. Sanctum is not your average Tower Defense title. When the havoc starts, you get to join the fray! As one of the world’s first First Person Shooter - Tower Defense games, Sanctum has taken the best of both worlds to deliver an epic, one-of-a-kind experience.
LEGO® Star Wars™ III - The Clone Wars™
LEGO Star Wars III: The Clone Wars will allow fans to explore endlessly and laugh their way through the Star Wars galaxy in the most humorous, accessible and action-packed LEGO game to date.
RIFT
Dive into a world of epic adventure! Create your perfect hero thanks to a uniquely customizable class system. Collect, craft, and customize your gear. Go it alone or group up to challenge dungeons, raids, dynamic open-world content, and your fellow players.
Magicka
Magicka is a satirical action-adventure game set in a rich fantasy world based on Norse mythology. The player assumes the role of a wizard from a sacred order tasked with stopping an evil sorcerer who has thrown the world into turmoil, his foul creations besieging the forces of good.
Alien Breed 3: Descent
Experience the final explosive chapter in the Alien Breed series and uncover the horrifying truth surrounding the existence of the Breed. Launch discount good thru Nov. 24 10am PST.
Call of Duty®: Black Ops
The biggest first-person action series of all time and the follow-up to critically acclaimed Call of Duty®: Modern Warfare 2 returns with Call of Duty®: Black Ops.
Lara Croft and the Guardian of Light
Take control of Lara and her new partner Totec, a Mayan tribesman, and uncover the ancient artifact known as the "Mirror of Smoke" in this all new action adventure game.
Dead Rising® 2
The sequel to the million-plus selling Dead Rising, Dead Rising 2 takes the zombie survival horror to Fortune City, America’s latest and greatest entertainment playground.
Alien Breed 2: Assault
Can you survive the alien onslaught? Gamers across the world will now have a chance to play the next chapter in this high-budget, high-quality series.
Worms Reloaded
Ten years on from Worms™ Armageddon and the turn-based comic mayhem continues in Worms™ Reloaded, an all-new edition available for PC through Steam.
Alien Swarm
Co-operative multiplayer game and complete code base available for free.