Nintendo's second handheld empire turns five years old this November. In half a decade, Nintendo has sold just under 108 million Nintendo DSes. Not only is it not ready to retire, the DS is on track to be the most popular devoted gaming machine in human history. Its popularity isn't undeserved. The DS hardware, a platform that was seen as too underpowered and eccentric to succeed before it was released, has fundamentally changed the way popular games are made.