Since Thursday, July 9th, digital retailer GMG has been running its 2015 Summer Sale featuring discounts up to 90% off on hundreds of PC games. The sale introduced batch of gaming deals each day, with deals lasting for about 24 hours. You now have a longer duration to check out all the PC game deals within the sale as the retailer goes into the "encore" phase. In addition to instant savings, there's a stacking 20% off coupon code which is making ridiculous pricing on several titles including $8 H1Z1, $12 Elder Scrolls Online - plus deals on noteable co-op franchise such as Borderlands and Evolve.

Nothing says end of an era more than a massive sale aimed at getting customers to buy up games they won't need once they have moved onto the One or PS4.  Call me cynical, but I don't mind when the games are this cheap.  This week sees a sale per day and a weekly sale on XBL, with up to 93% off games such as Portal 2, D&D: Daggerdale, Fable III and many others.

Portal 2’s co-op mode has a brand new DLC campaign that immerses players in the Portal universe more so than any other time before it. Using the PlayStation Move as the controller, we can now control the portal gun in a whole new way. The PlayStation Blog even stated it to be one of the best games to use the PlayStation Move peripheral to date (seal of approval included).

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 8th, 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.