What sets Half Life: Portal apart from the others in the series is that it boasts “a new type of single player game that changes how players approach, manipulate, and surmise the possibilities in a given environment in a manner similar to how the Gravity Gun changed our approach to how an object may be leveraged in any given situation.” Video after the break

The game itself is looking like the next evolution in puzzle games. You thought 3D Tetris was mind-blowing, wait until you see Portal. For those who haven’t been following Portal, the concept is fairly simple. You have a modified version of the grav gun. It can lift items, but can’t shoot them forward. That’s okay, because this new gun has a much more useful feature