GungHo Online Entertainment, Inc. is a Japanese video game developer and publisher. They are primarily known for hosting the Japanese server of Ragnarok Online, as well as their development of Ragnarok DS for the Nintendo DS. More recently, the company has reported huge financial success thanks to its mobile game Puzzle & Dragons, which, in 2013, was reportedly responsible for 91% of the company's $1.6 billion revenues for the year. Wikipedia