Im a sucker for Rush Hour/Parking Lot games. This is one of the best implementations Ive seen on the iPhone. The interface is very clean and easy to use. I find fancy car graphics distracting. Blue Block is simple but all of the information you need is obvious. It doesnt get in the way of working out the puzzle. Lots of puzzles (the most of any game of this type that Ive seen). And it keeps track of what youve done very nicely - even better in version 1.1.