For those who want to follow the course without access to the warzones (until the course is over), or just practice the material, you could play with some of the other warzones out there.
Just got to level10 of Nebula, literally 15 minutes ago. Been doing levels in bed before crashing out -- It's really good fun so far! Highly recommend.
There is https://exploit-exercises.com/ and http://overthewire.org/wargames/, the former is somewhat more pedagogical, but both are really good.