The clue with the fan blade thingees on the dials is bs....I dunno how anyone is supposed to figure out there's some kind of multiplication voodoo involved and it's not just the numbers that are in the windows.
The shape code clue was really hard to read, it would be nice to be able to zoom in on it. I also never found the clue for the two letter code on the first screen, I ended up getting it by luck. Everything else was pretty doable. :)