It's really hard to say. I guess it's because I go through times where I only care about one game, which is better from having a favorite you play all the time. Right now, I've been playing PMTTYD. A couple of weeks ago, I was obsessed with SSBM. Before that, I couldn't stop playing the Mario Karts. I think next is going to be SMS and SM64... It's seriously a lot better than playing just one while letting your other games sit in dust for months at a time.
A bird can fly… But a fly can’t bird!!! –Bird Person<(^v^)>