Metro - Animal Crossing New Leaf is my game of the year so far. It sits above BioShock infinite and The Last of Us for me and here is why. (spolier warning)
I never played Animal Crossing: Wild World and only played the primitive GameCube version. However, since its 3DS release late June I have played this game constantly at least for an hour a day on the commute to and from work. This is a game similar to Dark Souls and Monster Hunter and is only rewarding based on the effort put into it but without the difficulty curve.