My favorite game of all time? I have so many though. Oh hmm....the one game I can always go back to and not be bored is Harvest Moon: Friends of Mineral Town.
Favorite of all time is a toughy @_@ I'm sadly going to probably have to just give it to League of Legends! xP Such a simple concept of a game and it got me addicted since the first moment I played it. It's something I can pick up and play any time and they're always constantly coming out with new characters and features that keeps me following it and interested even when I'm not playing. I love the storylines and uniqueness behind all the different characters.