Hopido
This game is way too addictive. For the last couple of weeks I've noticed fooling around with it more and more often on my iPhone. And it's not due to the game being whipped together by my friends at Moido Games, not at all. The fact is that it's really really good. And really really addictive – if you're into puzzle games and seeking for something a little challenging.
I admit, though, if you get frustrated easily, don't try it. What starts out innocent and easy becomes increasingly challenging as the puzzles get bigger and – eventually – downright evil... I just cleared the easy puzzles last week and look forward to making my brain hurt with the next levels. :) I'll let you know if I get too annoyed and end up throwing my phone to the wall, but somehow I can't see it happening. It's too addictive.