| “Our self-powered energy walls define the perimeter of our domain. These walls use an intelligent force field that distinguishes between friend and foe. This permits our forces to shoot and move through freely, while blocking enemy movement and fire.”|
- ↑ Grey Goo - Humans: Architects of Destiny. YouTube. Retrieved 2015-03-24.
- ↑ Petroglyph Games, Grey Box, Grey Goo. January 23, 2015.
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