There are perhaps six or seven thousand languages in the world. Even so-called hyperpolyglots, people who learn to speak six or more fluently, barely scratch the surface. You and I will never be able to speak all these languages, but perhaps we can learn to recognise just a few. That's what the game's about.
Originally the game relied exclusively one one or two broadcasters that supported many languages, but now it has been rebuilt to use an more open set of audio samples, in the form of the Wide Language Index. The Wide Language Index is a listing of internet radio and podcasts in many languages. To get your language added, first find an online sample of it, then propose that it be added to the index. See Adding an audio sample for more details.
Are you a researcher or hobbyist interested in what languages people confuse? Take a look at our confusion dataset, containing some 16 million user guesses. I describe it in more detail in this blog post.