Thinking with portals, what happens when you threaten Gaben, and what defines and MMO.

Aperture Tag: The Paint Gun Testing Initiative puts you back in chambers with new tools and ways to solve them.

Aperture Tag: The Paint Testing Initiative pulls players back into the lab.

Words of wisdom from the voice of GLADoS.

Cave Johnson would be proud.

Best team player of the year.

Community manager kills the latest rumor about the Last Free Man.

Part the last.

Peer Review will release on October 4th.

Valve's trade winds pick up steam. My deepest apologies for that terrible, terrible pun.

Valve speaks about the content's release time frame.

More music than you can shake an incendiary lemon at

Music to fulfill your sophisticated auditory desires.

Look at you, flying majestically through the internet. Like a review... piloting a blimp.

More exciting testing opportunities coming this summer.

Extend your stay at Aperture Labs.

First they took the cake from you and now you can't even have a turret.

"Do you know the biggest lesson I learned from what you did? We're a lot alike, you and I. You tested me, I tested you. You killed me, I – oh no, wait. I guess I haven't killed you yet. Well … food for thought."

Valve releases the fourth and final humorous ad for Portal 2.

Aperture answers all of your burning questions about their talking turret technology.