Plain Vanilla Corp., the Reykjavik, Iceland-based mobile gaming developer behind QuizUp, raised up to $7.5m in promissory notes convertible into a minority equity stake from Glu Mobile Inc. (NASDAQ:GLUU), a global developer and publisher of free-to-play games for smartphone and tablet devices. Launched in November 2013, QuizUp currently has more than 40 million registered users […]