Hello my friend! If you pay attention to the directions the eyes look you'll see that there will be one direction no eye is looking, unless you already made a wrong turn, in which case all directions are being watched.
Hope you find you way in the labyrinth! Best of luck!
My bad. I somehow missed the passage to the hammer.
One serious question though (I assume the answer might be "game logic"): why do dark/unlit passages have invisible walls that vanish once you get a torch?
Hello there! You are correct, that is game logic basically. Those walls are there to prevent players from getting lost inside dark corridors and getting stuck.