Portal 2' was perfect - but can Valve pull it off again with 'Portal 3'?
Portal 3 | Video Game Fanon Wiki | Fandom
Video Game for Xbox 360 : The Orange Box feat. HALF Life 2, Team Fortress 2 & Portal *Used* (NTSCJ / Valve / Mature), Video Gaming, Video Games, Xbox on Carousell
Portal, Fable III, More Now Playable on Xbox One via Xbox 360 Backwards Compatibility - Niche Gamer
Portal 3 Xbox 360 Spain, SAVE 37% - wildlifeasia.org.au
Portal writer says he wants to start Portal 3 because he's 'not getting any younger' | VGC