CathyW wrote:While described as Ultra Fiendish, I don't think they're as difficult as some of the Sunday Times Superiors - although I did make use of the uniqueness principle in solving the second one which I didn't know about when they were published in October.
I'm not sure they're necessarily meant to be harder than Sunday Times Superiors - they were difficult HARDs, as opposed to the V.Hard, you get in the Sunday paper. It's confusing though, because the ones in that Ultimate Su Doku book that were called ultra-fiendish really are V.HARDs.