What is Reddit's opinion of Quizduell?

From 3.5 billion Reddit comments

Quizduell: https://play.google.com/store/apps/details?id=se.feomedia.quizkampen.de.lite

Here in Germany, this simple quizzing app suddenly went viral some years ago. It was not even very well-made and had some bugs and I doubt that there is an English version of it. But everyone had it, and so it was possible to start a quiz and compete with nearly every friend or co-worker.

It may or maybe not be this game. Probably only poplular in Germany because of the language. Still, it's good fun if you have a memory for unimportant trivia.