Rooted 
Thanks to @egre55 for this box. Learnt new stuff and definitely put my programming skills to good use
Foothold
So, you know what it is. Look in every crack and hole. You need to get the interesting thing in a specific place.
User
Just more of the same, read every thing, your usual enumeration.
Root
Actually pretty fun to be honest, new for me personally.
See which groups you’re in and check what kind of files can you play with.
Do your usual enumeration and once you put the pieces together and find the files to play with, play with them, but be quick. You don’t have all day.
Once you realize a way to execute commands you’ve basically got endless ways of escalating privileges.
My DMs are always open for nudges or discussion about the machine