GungHo Online Entertainment, the new owners of Suda51's Grasshopper Manufacture, is estimated to me making about $65 million a month, or an average of $2 million a day, from their one mobile puzzle title, Puzzle & Dragons. These figures come by way of Gamasutra, taken from GungHo's latest financial report.
The mobile game was released last February in Japan, and an European and North American version was released last November. In that time, the game has pulled in over eight million registered users. And as of January 2013, sales have totaled $91.6 million.