Portal

"Now you're thinking with Portals!" - GLaDOS during Portal trailer.

Portal
'Portal''' is a single-player first-person puzzle game developed by Valve. The game was released in a bundle package known as The Orange Box for PC and Xbox 360 on October 9, 2007, and for the PlayStation 3 on December 11, 2007. The Microsoft Windows version of the game is also available for download separately through Valve's online delivery platform Steam and was released as a standalone retail product on April 9, 2008. The game consists of a series of puzzles which must be solved by teleporting the player's character and other simple objects using the Aperture Science Handheld Portal Device. The goal of each chamber is to reach an exit point, represented by a circular elevator. The "portal gun" and the unusual physics it creates are the emphasis of this game.