Well the unthinkable has finally happened. Microsoft has allowed Valve to update one of the games on Xbox Live with free downloadable content. Yes, look outside your window and witness that the skies have not turned red, seas are not bubbling cauldrons, this is not the end of the world as we know it. But it could be an indication that Microsoft is getting a little more lenient for developers that want to reward their fans with access to free DLC.
The Portal 2: Peer Review DLC is live on the Xbox Live Marketplace as we speak, and can had freely. The game add-on features a brand new cooperative track continuing the story of Atlas and Peabody. The DLC also features single and multiplayer challenge modes, and leaderboards.
Follow the link below to get your download started.