It would seem there might be 'clues'in the book on how to solve the first stage puzzle, or for later puzzles (instead of just applying a normal book code)...
I find this passage in Chapter Six interesting:
"He moved toward the staircase....... A series of security measures stood between him and his custom-made vault. He had the customary high-end procedures...... Then he had something unique. He had a puzzle combination lock with a series of step sequences based on the pressure applied........"
I made something that I think is completely unique to myself. That said, anyone can solve this! That’s what makes it fun. A master of puzzles or someone that has never solved a puzzle in their life might be the first person to make it through stage 1!
Are those first stage puzzle numbers used like a 'combination lock' perhaps or something similar?