I'm guessing it's a bit where you can always take three routes (low, middle or top). If you put the sound on you'll hear a 'ting' or a 'uh-uh' noise depending if you chose the right route or not. If you get it wrong you go back to the start. Just learn where the 'tings' are and remember the route to take.
Failing that, look at
GameFaqs