My high score so far was 1450, but mostly because I can actually identify a significant number of the languages. When I'm guessing it's a lot harder.
(Unfortunately they end up reusing audio clips after a while so I think I'll get better with an unfair practice effect. Still, most of the clips are new.)
The only odd part of the quiz is that the multiple choice answers are completely random. So Chinese vs. Italian, easy. Kannada vs. Malayalam or Maori vs. Samoan or Slovak vs. Slovenian, I have little chance. And the number of possible answers increases as you do better, so it gets fun when there are 6 or 7 to pick from!