It’s time for our second annual mystery sound extravaganza!

Regular listeners of Brains On know all about our mystery sounds. Every episode we test your ears with some puzzling noise and give you a chance to guess what it is. There are so many great mystery sounds in the world — and many, many of them have been sent to us by our listeners. So many, in fact, that we decided to devote an entire episode to these magical, magnificent, mellifluous mystery sounds.

There are a whopping 10 sounds for you to guess in this episode. Are your ears up to the challenge?

If you’re the kind of person that likes a little friendly competition, make a score sheet with your answers. We’d love to see which ones you got and, better yet, what you guessed for the ones you got wrong. Upload pics of your scoresheet with #BrainsOn. Happy guessing!