Rooted.
Really fun machine to kill some spare time. It was my fastest so far.
Hints:
Foothold: Basic enumeration
User: What’s on this machine? How does it work? Enumerate and read the documentation about it. Check a particular odd permission for a more obvious hint (it won’t make sense if you don’t read the documentation).
You can get user through 2 different ways from that point.
Root: In your face. I recommend reading GTFOBins after finding it.