Opinion: too CTF-like for my taste.
Nudges: 1) When you feel like you’ve exhausted all enumeration, it’s time to figure out how to satisfy the odd one. 2) Try the only information you have (assuming you found it), but perhaps go from the /R.+/. to the /A.+/. 3) Who’s the boss? 4) Oh look, another one! 5) Many ways, one goal.