Correction: According to Plain Vanilla, the Securities and Exchange Commission document it filed on March 17 is for its $22 million funding round from December. We apologize for the error.

The question-asking business is doing pretty well these days.

Take QuizUp developer Plain Vanilla Games, for instance. That studio just raised another $21 million in funding, according to an Securities and Exchange Commision filing. This is on top of the $27 million the company raised through previous funding rounds from investors like Sequoia Capital, Tencent, and IDG Ventures. QuizUp is an extremely popular free-to-play mobile title that has gamers facing off against one another in quick knowledge-testing sessions. The developer finally released QuizUp for Android earlier this month.

We’ve reached out to Plain Vanilla to ask who invested and what it plans to use this influx of cash for.

Investors are likely rushing to fund Plain Vanilla due to its growing player base. QuizUp now has more than 12.5 million players on Android and iOS. That’s up from 5 million at the end of 2013. It added 1 million new users in its first week on Android.

Its popularity makes sense. The title has a clean, responsive interface, and QuizUp enables people to show off in over 300 categories. If you don’t do well with general questions, then hop into the Star Wars category and dominate with your encyclopedic knowledge of the expanded universe.

While Plain Vanilla’s value is taking off, it is totally dependent on the success of one game. This could prove a problem like it did for Draw Something developer OMGPOP. Zynga purchased and  shuttered that studio after the developer (at that point known as Zynga New York) failed to re-create the success of Draw Something for the sequel.

Plain Vanilla founder and chief executive officer recently told GamesBeat that now that his company has finished the Android port, it will focus on expanding into new markets.

“Trivia is very language dependent; we’re only really seeing good traction in the U.S. and the U.K.,” Fridriksson said.

Cash from investors could help it to accomplish that. The studio is currently focusing on adding Spanish, German, Japanese, Chinese, and Korean language questions to its games. That means translated content, but it also means questions tailored for each region’s specific culture.

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