really good
I like your difference games, they are really fun.
I would like to suggest however, for the 'play with hints' part of the game. It shows me a hint after like 30 seconds or something from starting each puzzle. Why!?! It should only show me a hint if I haven't found any differences for a while. Having a hint system is good, but its kind of broken right now.
Still this was really fun. My fav difference game ever would be the one where the girl is dreaming in her classroom.