I like the ones labelled "difficult," though I would never play them online competitively. It can take me a long, long time to complete them. I love the challenge: false leads, can't count on letter frequency, etc. I spend hours on these. With the ones lablelled "average," there's usually an "in," a hint to get you going; while I love all cryptograms, I especially like the ones that I have to mull over and over. Plus, I have a book of 300 cryptograms in the easy-medium range, so I'm all set there (book by Kappan puzzles). And I buy variety puzzle books that have cryptograms. I never claim to be good or fast. I'm sure anyone here could kick my rear. I'm just having fun.