Nice, but one unforgivable bug
Yup, no last diff, no hint. Also, the sound doesn't play for the last few diffs on level 2.
All in all, I'd say it's cute, but the lack of a last difference is a BIG frustration in these games.
See this screenshot:
There is NO final difference on Level 3! Can't find it. Used hint three times and it didn't Hint! Fix please.
Please see the level 3 hints.
I'm sorry but on my side everything works perfectly