Consoles might have had the split-screen co-op advantage on Portal 2 that their PC counterparts didn’t for a good while, but those days are now gone. Along with some minor fixes, Valve has recently added the split-screen co-op mode to the PC version of Portal 2, making Steam the undisputed best way to experience the entire game on one platform.

Is cooperative gaming a counter towards the development of potentially violent behavior? Studies have shown that it’s true! Video Game psychologists have looked into the opposite spectrum of video game violence to discover if playing violent video games under certain circumstances will ultimately lead to more cooperation and trust in real-life behavior.

Science is always better with a friend to share it with. The Portal 2 “Perpetual Testing Initiative” now offers a co-op mode for all test subjects to construct and test chambers to their hearts content.

Normally, kids should absolutely dread going to summer school. In this circumstance, however, Valve has taken that notion and thrown it completely out the window, promoting their new education portal, “Steam for Schools”, with the help of Portal 2 this summer.

Website NeoGamr talked with Valve about Portal 2 and the recent level editor that was released.  During the interview it was revealed that over 4 million copies of Portal 2 have been sold to date across all platforms.  To celebrate the milestone, as well as celebrate the release of the Portal 2 Perpetual Testing Initiative, the game is now on sale on Steam for just $6.79.  

What’s up the guys at Valve, giving us all this new content for Portal 2 after only a year of being released? Coming on May 8^th, the “Perpetual Testing Initiative” DLC will be available for those science lovers looking to take a page out of GLaDOS’s book and do a ton of testing.

It is important to take a true work masterpiece of a video game, Portal 2, and fully appreciate every single thing that was put into making it. Now we can, as Dark Horse announced its upcoming book, The Art of Portal 2 will make taking a break from the controller totally worth doing.

Community group known as Stabyourself.net has finally accomplished a gamer’s dream: taking two awesome games by two legendary publishers, Nintendo and Valve, and put them into one, stellar game.

2011 was an incredible year for co-op gamers. We saw 100s of releases of co-op games. When we started this site, co-op was barely a bullet point on the back of a box, now it’s a standard feature in many AAA titles. After sifting through all the titles we've weighed in, discussed and voted on our favorites for the year. Here are is the 4th Annual Co-Op Game of the Year Awards.

Sure, you could buy some co-op game for the PS3, Xbox 360, or (insert other generic console here), but c'mon! We both know the truth. We both know that what you really want is a game on a platform where you can tweak those graphics all the way to 11; a platform that holds no illusions about install times, patches, or updates. Staffers Mike "pheriannath" Katsufrakis and Jason "OrigamiPanther" Love are here to point you towards the best hardware and software on which to drop some holiday green.

The first Portal 2 downloadable content, ‘Peer Review,’ added a new challenge mode and co-op levels. Valve has just announced a second DLC that doesn’t seem to include new levels, per se. Instead, it will bring a full-on in-game level editor. The thought of cooperatively designing levels with a partner is certainly enticing.

Portal 2 is finally getting the long awaited free DLC on all versions of the game next week.  Titled "Peer Review," the content is focused on the co-op side of things, putting players back in the roles of Atlas and P-Body for a whole new set of cooperative testing levels.  

Portal 2 gives FPS/puzzle fans plenty to do, but it’s understandable that many players are hungry for new content by now. Thankfully the first downloadable content is not far off. I’m talking September!

Today Co-Optimus is proud to present an introduction to our very first video series, which will be kicking off this Fall.  Called Good Co-Op. Bad Co-Op - it'll follow the co-op hijinx of Locke and Sunflower who up until this point, were sworn mortal enemies (not really).  The series originally started as something called Big Chief Friendship which we present to you today.

Crushing robot hugs for everyone!