A new report from the mobile mavens at Pocketgamer claims that GungHo Online'smay be the first mobile game to break $1 billion in revenue.The claim is based on GungHo Online's reported financial performance for the fiscal year ending December 2013.GungHo reportedly earned $691 million in sales through the iOS App Store and $820 million through the Google Play store during 2013, for a total of more than $1 billion in revenue from the mobile market.The lion's share of that revenue probably came through the publisher's breakout mobile hit-- the company claims that sales tied togames on iOS, Android and the 3DS accounted for roughly 91 percent of GungHo Online's reported $1.63 billion in sales revenue for the year.That's roughly 530 precent more sales revenue than the company was generating a year prior. Thanks to that growth, GungHo Online's net profits for the year jumped up to a reported $520 million, 570 percent more than it earned in 2012.