Tokyo-based game maker GungHo, the company that entered a joint venture with RockYou and SoftBank in July 2009 in Japan, just released Homerun Hero, a cute social baseball game on Mobage (which has nothing to do with said JV).
Needless to say, the game allows users to play against other Mobage players and is monetized via sales of virtual items, for example special helmets or uniforms.
Homerun Hero is exclusively available on Mobage for Japanese feature phones. It has been developed by Korean mobile game maker Neocyon.
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