Portal 2 Logo PNG and Portal 2 Logo Transparent Clipart Free Download. - CleanPNG / KissPNG
I just realized that the "(What idiot picked these-)" turret in the Portal 2 Turrets ad has the colors of Black Mesa, Aperture Science's main rival. Cave Johnson probably says "what idiot
Can Portals Move? [Portal 2 Analysis] - YouTube
Portals - Portal Wiki
Ultra speed and colors for Portal 2 (Mod) for Portal 2 - GameMaps.com