Rated hard, that seems fair! It’s a tough one with many steps and lots to research. Excellent box to root, learned a lot

Part of Incognito CTF. A clever box, rated medium, with a simple but effective route to root. Probably about the right level

A windows machine, rated medium, this box is pretty hard at times if your Windows skills are not fantastic (like me!). A lot of fun though and excellently made

A linux box, user rated Easy/Medium, Armageddon is a bit of a black & white situation, if you find the user exploit fast then pretty easy, otherwise you could be looking for a while. Root on the other hand is a pretty simple privesc

Another box in the ‘New Year’ series by MuirlandOracle. This box is rated hard, but to my mind is not as difficult as some of the other machines in the series

A room by MuirlandOracle, rated hard, with a very tricky foothold but then pretty straightforward for a Windows machine