Carla, aside from the pixelated graphics, one of my main problems is having to choose the "exact" single word when I'm trying to ask questions in Part 4. I am positive the game's maker is not a native English speaker but even if he were this would be a tough job, to guess the exact word he's thinking of. He did it once in another installment of the game and I got through that but this time...yeek! If you have any better luck, should you play that far, I could really use some help!
Enjoy your quest with Professor Ketmeier.
Gil.
Btw, one of the puzzles features a very famous clock in Prague.