[img id='68977' txt='' align='left'> Please note that # _ is now available on the marketplace the first DLC for Portal 2 called "Peer Review" that adds a new two-player cooperative campaign, continuing the story of two little robots Atlas P-Body and GLaDOS, a challenge mode is single and online leaderboards to compare your times with those of friends and community of the game. The additional content is completely free and can be appended to the web by going to occupy 1.37 GB on your hard disk.