Nintendo is preparing to offer up its next mobile game, and rumor has it the company is hoping this one will be a gold mine. Given the franchise it’s from — and what Nintendo has done adapting its less well-known series — it probably will be. A new report from Bloomberg, which focuses on the prospects of Nintendo in China after a rather lackluster stateside year, quotes an insider as saying the company is betting a lot on the upcoming smartphone app Mario Kart Tour.