Portal 2

Portal 2 draws from the award-winning formula of innovative gameplay, story, and music that earned the original Portal over 70 industry accolades and created a cult following.

Portal 2 take place hundreds years after the first game .In this game player returned as Chell while GLaDOS and the rest Aperture Science Facility has been abandoned. Chell is awakened by one of GLaDOS's personality cores, and inadvertently wakes GLaDOS. Then GLaDOS is immediately displeased at Chell's return and begins testing her again through numerous chambers as she rebuilds the dilapidated facility.

The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters. This new mode forces players to reconsider everything they thought they knew about portals. Success will require them to not just act cooperatively, but to think cooperatively.