Well, I'm stuck already. Nikopol is looking like a game where I'm going to get stuck a lot.
Anyway, I'm trying to "install the code." I have the block of salt, but I can't figure out how to create new floor tiles. I'm guessing this involves the vending machine, but I can't figure out a way to distract the guard or disable the mirror.
I'm also not sure if I have the wall symbols right. When I click on the wall, the guy says I have the symbols wrong, but I don't know if he's referring to just the walls or to the entire room. I have the symbols as (from left to right): skull, horn, snake / hat, dad, wheel / hanged man, cup, tree. As far as I can tell, that fits the clues.
SWC