Original music.
The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, and a much larger set of devious test chambers. This new mode forces players to reconsider everything they thought they knew about portals.The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters. Success will require them to not just act cooperatively, but to think cooperatively.