Portal gameplay revolved around a device called the "Aperture Science Handheld Portal Device", or ASHPD. This device can create portals on flat panels allowing the user to instantly travel to any location in space. Portals are restricted to planar surfaces, but if two linked portals are on different planes, bizarre and crazy things can happen. There can be odd twists in geometry and gravity, like falling endlessly in space or falling towards your death.
~Also available on: PC, Xbox 360, Playstation 3
Game Reviews Index
2007-10-09 
