Greenhorn is a easy linux box, with a easy path to follow if you enumerate through and avoid the deep rabbit holes. Sudo privilege was interesting with a PoC technique to follow.
Bank was an pretty straight forward easy linux box, though two of the major steps had unintended alternative methods which I had a lot of fun enumerating.
Perfection is an easy Linux machine that features a web application with functionality to calculate student scores. This blog serves as a Sanity Check and thought dump for those pursuing the Certified Bug-Bounty Hunter (CBBH) path on HackTheBox.