The initial tutorial levels guide the player through the general movement controls and illustrate how to interact with the environment. The player must solve puzzles using the portal gun, formally known as the Aperture Science Handheld Portal Device, which can create two portals connecting two distant surfaces depicted as matte white, continuous, and flat. Characters can use these portals to move between rooms or to "fling" objects or themselves across a distance. Outlines of placed portals are visible through walls and other obstacles for easy location.
-System: Windows 7 / Vista / XP
Processor: 3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
-Memory: 1GB XP / 2GB Vista
Hard disk: At least 7.6 GB of Space
- Video: Video card must be 128 MB or more and should be a DirectX 9-compatible with support for Pixel Shader 2.0b (ATI Radeon X800 or higher /-NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher).
password : gudang-gamers