It's been an exciting couple days at PAX, especially if you're a Portal 2 fan! We're following up the co-op campaign screenshots released yesterday - with actual footage from the co-op Portal 2 ...

Portal Reloaded co-op is here, as the astounding Portal 2 mod that introduces a time travel portal to the Valve puzzle game gets an update years down the line. While Portal 3 feels as far off as a ...

GameSpot may receive revenue from affiliate and advertising partnerships for sharing this content and from purchases through links. According to GLaDOS, Portal 2’s dry-witted antagonist, scientific ...

Nine minutes of co-op gameplay for Portal 2 has come out of PAX, and it's looking pretty sweet. As the video explains, the two-player co-operative mode allows both players to control separate portal ...

The Portal Reloaded modification for Portal 2 has today released its Cooperative update bringing in new puzzles to solve in Co-op mode. According to the Steam Page Portal Reloaded is a free, community ...

Besides having a really amazing single-player story, the co-op mode in Portal 2 is what keeps you going back. It can be all about killing your partner in the most treacherous ways, or finding the ...

Portal 2 was shown to the public for the first time at PAX Prime last weekend, and while no one got hands-on time, Valve's Josh Weier was there to show us a bit of the puzzler's co-op portion. First ...

This extended trailer for Portal 2's co-op mode, shown to attendees at PAX 2010 behind closed doors, adds narration from GLaDOS. I'm sure you've seen the two loveable robots before, but this video ...

Valve, fresh from not announcing Half-Life 3 at Gamescom, has released a free PC update for Portal 2's puzzle maker that allows co-op test chambers to be built. The patch also brings a Quick Play ...