Whew, that was a pretty awesome ride! You ran this event flawlessly - definitely better than I myself could have done! It was an honor to take part, and I thoroughly enjoyed every bit of it. Great work out there, and thanks for putting so much love into this event! <3
As for your questions...
Overall, how did you find the difficulty of the puzzles?
I don't think I can give an accurate answer for this (considering I've been involved with WTP for about 37 weeks now), but I found most of them pretty easy! There were a few tricky ones, though, so that was a nice twist!
Which one was the hardest? Which one was the easiest?
I'd say the hardest one was definitely Sawsbuck, while the easiest was Froslass! (Heh, funny that I thought the last one was the hardest and the first one was the easiest. xD)
Did you find any of them unfair? If yes, which ones and how so?
Nope! I personally don't think any of them were unfair. Heck, you even gave us a nice little warning for the Arceus puzzle, which actually made things a bit easier. :P