COOL! once more!first I say this: hardest are op 10 #1-2 op 25#6then someone will disagree...then some pretentious dude will say: I find op 10#2 easythen someone will say op 10#4 is hardest if played at Richter speed (1:31)then another will say something like op 10#6 is musically the hardestso on and so on