I finished my 3-months course on the amazing pentesting platform Virtual Hacking Labs for OSCP preparation. It costs €279.60 for a courseware PDF and my lab access credentials. At the end of the self-taught course, I managed to root all 43/43 machines (mostly in Linux and a few machines in Windows). Also, some Windows machines have been retired probably due to license problems, but VHL incrementally adds several new machines each year.

More details about these machines (sorry, I cannot reveal the keys) as shown in the table below.

Also, read this blog of falconspy for more details about this course and join the discord for more discussions (in case you need hints).

Happy hacking :-P