The story is based on alien invasion of a planet that has a dormant defense grid. As the player is re-activating the defense system with the assistance of a computer to control the machinery and with only limited resources, the aliens attempt to steal power cores. Power cores are “tiny floating orbs” that provide vital power to the defense grid. Once all power cores have been stolen the game is over. Only one power core need be remaining when the last wave of aliens is killed to complete a level.
Defense Grid is set in the distant future. Most levels feature ancient ruins with defensive military bases built amongst the decaying structures. The game was originally planned to be set amongst an urban environment which has been ravaged by war but that was changed to something more original. The main character in the game, which is called the Entity, is a computer with human-like qualities that wants to protect his homeworld from destruction.
Source: Wikipedia, Game’s homepage
Minimum system requirements
Processor : Intel Pentium IV at 1.8 GHz or better
Video Card : 128 MB VRAM – DirectX 9.0 Compatible with Pixel Shader 2.0 Support (nVidia GeForce 6100 or better / ATI Radeon 9600 or better
Memory : 512 MB RAM
Hard Disk : 1 GB of free Hard Drive Space
Operating System : Microsoft Windows XP / Windows Vista
Sound : DirectX Compatible Sound Card
Direct X : DirectX 9.0c or higher, June 2008 version or later
Controls : Keyboard & Mouse
Installation : CD-ROM Drive
Recommended system requirements
Processor : Any Dual Core Processor at 2.0 GHz
Video Card : 256 MB VRAM – DirectX 9.0 Compatible with Pixel Shader 3.0 Support (nVidia GeForce 7600 or better / ATI Radeon X700 or better)
Memory : 1 GB RAM (XP)/ 1.5 GB RAM (Vista)
Hard Disk : 1 GB of free Hard Drive Space
Operating System : Microsoft Windows XP / Windows Vista
Sound : DirectX Compatible Sound Card
Direct X : DirectX 9.0c or higher, June 2008 version or later
Controls : Microsoft Game Controller for Windows
Installation : CD-ROM Drive
