Portal 2

The Aperture Labs await you in Portal 2, where you'll once again face the lethal ingenuity of GLaDOS, the power-hungry AI. Meet a cast of additional characters as you puzzle through dangerous, never-before-seen sections of the labs and a wider variety of portal puzzles. Portal 2 also includes co-op play with local, split-screen, and online multiplayer so you can navigate through portals with a friend.