G-Mode Corporation is a Japanese company that specializes in games for Java-compatible mobile phones. The company also licenses content for mobile telecommunications operators, as well as being involved in the original equipment manufacturing of mobile phone games.

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.