I beat you, Ghost! It was fun being some combination of James Bond, Jack Bauer and JC Denton. I wasn't allowed to play the recorder at school because I literally couldn't tell high and low notes apart (true story) so the exact direction of the guards was sometimes an issue for me. However, I made it through the corridors and completed my mission just by knowing when to be careful. I found navigation a little bit trial and error. I think a hint at the beginning would have been useful - 'you're entering from the west, the terminal is somewhere on the east side' would have given an idea of what to aim for. That's a nitpick, you brought together the spy thriller feeling really nicely!