Portal 2 is a first-person perspective puzzle game. Players take the role of Chell in the single-player campaign, as one of two robots—Atlas and P-Body—in the cooperative campaign, or as a simplistic humanoid icon in community-developed puzzles. These four characters can explore and interact with the environment. Characters can withstand limited damage but will die after sustained injury. There is no penalty for falling onto a solid surface, but falling into bottomless pits or toxic pools kills the player character immediately. When Chell dies in the single-player game, the game restarts from a recent checkpoint; in the cooperative game, the robot respawns shortly afterwards without restarting the puzzle. The goal of both campaigns is to maneuver through the Aperture Science facility. While most of the game takes place in modular test chambers with clearly defined entrances and exits, other parts occur in behind-the-scenes areas where the objectives are less clear.
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 requirements:
-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).
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