DECA Games is a game publisher and developer of video games that is headquartered in Berlin, Germany. The company's primary focus is on acquiring and operating older free-to-play games as a service. They are the current owners and developers of the massively multiplayer online shooter Realm of the Mad God. The company has also acquired a number of free-to-play mobile games, including DragonVale and multiple titles from Japanese publisher GREE (including Crime City, Knights and Dragons, Modern War and Kingdom Age).