Thank you, I understand.
I played the game with cube-size 5^3.
The starting cube was always (012/012/012) and all adjacent cubes have an prime number (011 or 013), but only the below cube (012/012/011) didn't trigger when I fell into. I thought it was odd.
Anyway, I really enjoyed this game because I felt most respect for the original movie.
I'm looking forward to the day the Exit is implemented.