I played through the whole game. At the end, where I have to play a tune to get the code to release the stairs, I am stuck. For one thing, I have no sound at all (3rd gen iPad) and had to go get the sequence from a walk-through. I got one from a type walkthrough and then watched a video. The sequence IS NOT working for me at all. So- I am at the very end and can't get to the helicopter.