Portal 2

Game description:

Welcome to the reality you’ve met in science-fiction books and movies. Chell wakes up in the same research centre. She looks around, sees only old furniture and suddenly somebody’s speaking to her from behind the door. It’s Wheatley, the intelligence dampening sphere. It will guide Chell through the centre, which is actually going to collapse. The girl will have to explore every cell and find a way out from the place. If you like shooters and mysteries, this game is definitely for you!