Portal is one of the best puzzle games ever made on flash platform. You play the role of a nonspecific test subject who is forced into an array of challenges by Aperture Science, the inventor of the Aperture Science Handheld Portal Device (ASHPD). They test you to imagine beyond the standard laws of physics and utilize the ASHPD to accomplish the impossible tasks. The game includes over 40 challenging, portals thinking levels - energy balls, cubes, turrets and even the famous crusher. Challenge the laws of time and space with your portal gun and beat every level.