Japanese developer and publisher GungHo Online Entertainment is estimated to be earning around $2 million a day from just one free-to-play mobile game.
As reported by Japanese industry consultant Serkan Toto, puzzle and RPG hybrid title Puzzle & Dragons is thought to have generated around $65 million in sales on iOS and Android in Japan last month.
Players are tasked with collecting monsters, exploring dungeons and battling enemies by sliding and connecting three orbs across the screen.
The title has been out since last February on iOS and last September on Android in Japan, the title was also released in the US and Europe in November.
It is believed most of the game's success is derived from the Japanese market, having dominated the charts in Japan on both the App Store and Google Play.
At the time of writing, Puzzle & Dragons sits atop the Japanese top grossing chart on the App Store.
Figures for Puzzle & Dragons have been estimated from GungHo's own financial report which stated the company had made $92 million in sales during Janauary 2013, up more than 1,000 per cent year-on-year.
Total sales throughout 2012 grew 169 per cent to $280 million year-on-year, with profits also rising by an impressive 690 per cent to almost $100 million.
The figures of Puzzle & Dragons appear to even surpass the huge success of Finnish developer SuperCell's mobile operations, with its games Clash of Clans and Hay Day generating more than $1 million a day.