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	Portal 2: History and Theory - Part 10 (Treezoo) View
	Game Theory: Portal 2, Does Chell DIE (The Game Theorists) View
	Portal 2 - The Moron Theory (Leadhead) View
	Portal 2's Educational Version - An Obscure Part of Valve's History (Ossy Flawol) View
	The GLaDOS Design You Don't Remember - Portal (Ossy Flawol) View
	Portal: A History of Aperture (Timeline and Lore) (Skyrionn) View
	10 MORE Things You Didn't Know About Portal 2 (Syy) View
	Portal Gave Us The 2 GREATEST Video Game Songs Of ALL TIME (Charles Cornell) View
	10 Things You Didn't Know About Portal 2 (Syy) View
	Impossible Skip Destroys Portal 2 World Record - World Record History of Finale 1 (Msushi) View