GameSpot may get a commission from retail offers. According to GLaDOS, Portal 2's dry-witted antagonist, scientific achievement is all about cooperation. That's why one of history's greatest ...

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 ...

One of the longest lines at PAX 2010wasn't to play anything, but to see a live demo of Portal 2’s co-op mode. Valveonly showeda few of the mode’s puzzles, but we can say pretty assuredly that it’ll be ...

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 ...

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 ...

Portal 2 features a separate two-player co-operative campaign, playable over the internet, and new gameplay features include physics-changing paint. That's according to various reports and scans that ...

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 ...