| • | Extensive single player: Featuring next generation gameplay and a wildly-engrossing story. |
| • | Complete two-person co-op: Multiplayer game featuring its own dedicated story, characters, and gameplay. |
| • | Advanced physics: Allows for the creation of a whole new range of interesting challenges, producing a much larger but not harder game. |
| • | Massive sequel: The original Portal was named 2007's Game of the Year by over 30 publications worldwide. |
| • | The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements |
| • | A much larger set of devious test chambers. |
