Sometimes I buy a set of very hard fill-a-pix puzzles on my phone. Sometimes these are indeed very hard and therefore (for me at least) enjoyable, but more often than not they are too easy to be labeled very hard and they feel like a simple fill-out.
I think Conceptis should make more effort to classify the puzzles correctly, because it is stopping me and maybe others from purchasing these puzzles, being afraid that they may be too easy.
Furthermore I don't understand why there are tab-only fill-a-pix puzzles, that I cannot play on my phone. If I could, I would, because these might be harder to solve and giving nicer pictures, therefore giving more satisfaction. I would think that most phones can handle the larger sizes?