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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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!

Price -92% 2.42€
Rating 8.7
Release 22 Nov 2011
Saints Row: The Third Get ready for the most out-landish gameplay scenarios ever seen as the Third Street Saints take on the Syndicate!

Price -88% 1.21€
Rating 9.4
Release 17 Nov 2011
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

Price 39.99€
Rating 8.4
Release 07 Nov 2011
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.

Price Free to play
Rating 7.9
Release 02 Nov 2011
Renegade Ops Blast your way through enemy lines to defeat Inferno, a madman intent on global domination. Destruction just got awesome.

Price -57% 5.68€
Rating 8.2
Release 26 Oct 2011
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.

Price -75% 2.24€
Rating 8.1
Release 24 Oct 2011
PAYDAY™ The Heist Take on the role of a hardened career criminal executing intense, dynamic heists in constant pursuit of the next “big score”

Price 14.99€
Rating 9.2
Release 20 Oct 2011
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!

Price -41% 8.87€
Rating 9.1
Release 18 Oct 2011
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.

Price -98% 0.50€
Rating 7.5
Release 11 Oct 2011
RAGE Powered by id’s revolutionary id Tech® 5 technology, RAGE is an intense first-person shooter with breakneck vehicle combat, an expansive world to explore, and jaw-dropping graphics!

Price -86% 1.41€
Rating 7.6
Release 03 Oct 2011
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.

Price -53% 4.76€
Rating 9.4
Release 28 Sep 2011
Worms Ultimate Mayhem Load your weapons and experience a whole new dimension in destructive turn-based cartoon action!

Price -94% 0.88€
Rating 8.6
Release 28 Sep 2011
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.

Price -89% 4.10€
Rating 9.0
Release 05 Sep 2011
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.

Price 9.75€
Rating 8.2
Release 29 Jul 2011
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.

Price -96% 0.96€
Rating 7.0
Release 21 Jun 2011
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.

Price Free to play
Rating 7.0
Release 14 Jun 2011
Spiral Knights Join the ranks of the Spiral Knights. Stranded on an alien world, you must explore the ever-changing Clockworks beneath its surface.

Price Free to play
Rating 8.2
Release 14 Jun 2011
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.

Price 1.59€
Rating 7.2
Release 17 May 2011
Terraria Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. Four Pack also available!

Price -42% 5.72€
Rating 9.7
Release 16 May 2011
BRINK You decide the combat role you want to assume in the world of Brink as you fight to save yourself and mankind’s last refuge!

Price Free to play
Rating 6.2
Release 09 May 2011
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.

Price -86% 1.49€
Rating 8.6
Release 15 Apr 2011
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.

Price 19.50€
Rating 9.2
Release 22 Mar 2011
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.

Price Free to play
Rating 7.3
Release 01 Mar 2011
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.

Price -87% 1.34€
Rating 8.5
Release 25 Jan 2011