How well has Nintendo's first experiment in mobile gaming fared so far? Quite well... though it's not enough for the company's tastes. The gaming giant has revealed that Super Mario Run has pulled in more than ¥6 billion ($53 million) in revenue since its December launch. That isn't a whole lot for a company used to selling far more expensive games, but it's very healthy for a mobile title that's less than two months old. And Nintendo is better than most at turning users into paying customers. Out of 78 million total downloads, more than 5 percent forked over the money to unlock everything. Games consultant Serkan Toto tells the Wall Street Journal that this is "amazing" for a game with one $10 in-app purchase. Most rivals can't hit 5 percent even with $1 or $2 purchases.