I love the concept of this game but honestly it is too easy. I almost stopped after the first 20 levels but kept going because I like to finish things. I'm glad I did because I saw that the game actually had a little more to it in that you had to think a little. But that being said I can't call this game challenging. I feel like this is the puzzle version of a point and click adventure which is not a bad thing if that is what you are going for.
Very good game, a nice new take on this kind of puzzle game. Though I feel that on some of the hardest ones there wasn't a whole of skill involved, it was just a matter of finding two pieces that went together and were in the right spot and then you could just use process of elimination to solve the rest of the puzzle.