Fun, innovative and unique, with one or two minor problems.
There are only two problems I can find with the game play, the first being something that probably affects quite a few people but some would find it nothing wrong with it at all. There are several different ways of evolving your pins, one of which is through wi-fi contact. Me as a gamer hardly ever plays multiplayer and I know no one who owns this game as well. As thus, the only way i can evolve certain pins is by walking around waiting for my DS to pick up signal from another wandering DS. Because of this, some pins are unreachable and so I can never obtain the perfect 100% pins.
The second problem is that there can only be one save game per cartridge. This means that when I lent it to my best friend, she had to erase my game to start her own.
These are only a niggling complaints however, as many would find them no problem at all. Aside from this the game is perfect and I see no problem with playing it again, especially seeing as I already have.