Portal uses a concept that's a bit hard to wrap your head around without actually seeing it in action. The only "weapon" you're given is a portal gun that can shoot a portal entrance with the right mouse button and a portal exit with the left mouse button. Once both portals have been placed, you can walk though the entrance and find yourself at the exit. Walk through the exit and you're back at the entrance. The portals can be shot across a distance but only on certain surfaces, which creates the puzzle atmosphere. You'll have to figure out how to get across chasms, up and over obstacles, and around automated turrets.

Minimum Specifications: Pentium IV 1,7 512 MB RAM SVGA 128MB Direct 3D

Recommended Specifications: Athlon 2,6 512 MB RAM SVGA 256MB Direct 3D