Where some game makers beat you over the head with explanations and tutorials, Valve took a subtle approach with Half-Life 2 and taught you its rules without you even knowing.

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Games shown in this episode (in order of appearance):

Dead Space (Visceral Games, 2008)
Half-Life 2 (Valve Corporation, 2004)
Half-Life 2: Episode Two (Valve Corporation, 2007)
Half-Life 2: Episode One (Valve Corporation, 2006)
Portal (Valve Corporation, 2007)
Super Mario Bros. (Nintendo, 1985)
Mega Man X (Capcom, 1993)
Resident Evil 4 (Capcom Production Studio 4, 2005)
Super Mario Galaxy 2 (Nintendo, 2010)
Deus Ex: Human Revolution (Eidos Montreal, 2011)
Dishonored (Arkane Studios, 2012)
Assassin's Creed: Brotherhood (Ubisoft Montreal, 2010)
Far Cry 4 (Ubisoft Montreal, 2014)
Half-Life (Valve Corporation, 1998)

Egorapter's Mega Man X video - https://www.youtube.com/watch?v=8FpigqfcvlM

Music used in this episode:

Welcome Aboard the U.S.G. Ishimura (Dead Space)
Ravenholm Reprise (Half Life 2)
Hazardous Environments (Half Life 2)
Slow Light (Half Life 2)
Our Resurrected Teleport (Half Life 2)
Probably Not a Problem (Half Life 2)
Eine Kleiner Elevatormuzik (Half Life 2: Episode One)
Triage at Dawn (Half Life 2)
Hazardous Environments (Half Life 2)