Thanks for the feedback! A couple of hints for the passcode levels:
- First passcode level: brute force.
- Second passcode level: do a Google search for what the two hint disks tell you.
- Third passcode level: this is a tricky level, but basically use a combination of brute force and what the hint disks say.
- Note that you should never need to brute force more than one digit of a passcode.
> But then, I met a bug - in the level on the picture, the PgUp key didn't work and the PgDn returned me to the previous level. Please, could you help me? What's the passcode on the door that I'm standing in front of?
SPOILER: It's not a bug, and you don't need to know the passcode to that door :). Use the yellow/illuminated area as a guide to see where you can walk to.