Portal

Portal is a Single-player puzzle game released on Playstation 3, Xbox 360, Steam and Pc by Valve and is only available in the orange box on Xbox 360 and Playstation 3. Your player, Chell, wakes up in the Aperture Science Relaxation Vault and is guided through 19 test chambers by GLaDOS with the help of the Aperture Science Handheld Portal Device, or the Portal Gun. The Portal Gun is a complex, but easy to use, device which can be used by shooting 2 portals and walking through one, coming out the other.