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.
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Serious Sam II
Serious Sam II is a shot of adrenaline to the hearts of first-person shooter fans across the world. This is serious!
Star Trek Online
In Star Trek Online, the Star Trek universe appears for the first time on a truly massive scale. Players take the captain's chair as they command their own starship and crew. Explore strange new worlds, seek out new life and new civilizations, and boldly go where no one has gone before.
Earth Defense Force: Insect Armageddon
Thousands of giant insects and aliens once again ravage the earth, and only the Earth Defense Force can stop them.
Serious Sam 3: BFE
Serious Sam 3: BFE is a prequel to the original indie fast action FPS and Game of the Year sensation - Serious Sam: The First Encounter!
Saints Row: The Third
Get ready for the most out-landish gameplay scenarios ever seen as the Third Street Saints take on the Syndicate!
Call of Duty®: Modern Warfare® 3 (2011)
The best-selling first-person action series of all-time returns with an epic sequel to the multiple GOTY award winner Call of Duty®: Modern Warfare® 2
DC Universe™ Online
DC Universe Online is a Free-to-Play, massive multiplayer online action game set in the popular DC Universe. Become one of a new breed of Heroes or Villains and wield incredible powers as you go to war with legendary characters such as Batman, Superman, Lex Luthor and The Joker.
Renegade Ops
Blast your way through enemy lines to defeat Inferno, a madman intent on global domination. Destruction just got awesome.
The Haunted: Hells Reach
Winner of 2010′s Make Something Unreal contest, The Haunted: Hells Reach is a fast-paced horror game where your goal is to liberate cursed places and survive the assault of Hell.
PAYDAY™ The Heist
Take on the role of a hardened career criminal executing intense, dynamic heists in constant pursuit of the next “big score”
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.
Worms Ultimate Mayhem
Load your weapons and experience a whole new dimension in destructive turn-based cartoon action!
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.
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.
Spiral Knights
Join the ranks of the Spiral Knights. Stranded on an alien world, you must explore the ever-changing Clockworks beneath its surface.
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.
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.