Armageddon
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
linux
Year of the Jellyfish
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
Year of the Fox
A ‘New Year’ series room by MuirlandOracle, rated hard, complete with many rabbitholes and tricks. This one took a while!