I can get out of the first room in the game fine, but after that I spent about 15 minutes just knocking on doors and trying to guess a code. No idea what I'm missing. I tried listening to the scene in the opening cell a few times but didn't get much out of it. What am I supposed to be doing?

"count your struggle to find the next code."

Hi Alexis, What if you don't knock? Then, you haven't struggled at all. I call it a '0' struggle :)), Just Count your endeavor.