He did note that Crowdstar has launched its Happy Aquarium game in Japan on the mobile social network Mixi, where it is one of the top five games. That expansion into mobile will continue.

All of this success has happened so fast. Happy Aquarium is built on the free-to-play model, where the game is free and users pay for things like decorations and fish food.

CrowdStar titles including Happy Aquarium, which pulls in 11.8 million monthly active Facebook users, will soon arrive on Japanese social networks such as Mixi, Hangame and Gree - where they will ...