Disclaimer- this one is an extra fiendish, it was made by request- if you find it frustrating, my apologies, I'll mix up some hard and mediums tomorrow :)

I really enjoyed this one, that may be because this is one of the first ones I have managed to fully solve though. But I thought It had a really good balance of relatively obvious ones to get you on the path of groups and ones which are hard to unpack. Ended up finishing with 5 seconds to spare so for me, it was perfectly balanced time wise as well.

Thanks :)

Fun trying to solve, but too tough for me.