The hardest track you have done

Hi Guys and Girls I have decided to start a new thread it could be interesting.What has been your hardest track IE: [rocks,boulders,steep climbs,big drop offs etc ] I will start it off The Caples Track,direction Howden Hut up the mountain accross Mc Keller saddle and down to Mid Caples hut reason:steep climb no track to speak of,moss,rocks,big boulders huge tree routes and walking it the other way would be harder