Metroid all the way. Mario and Zelda are okay but they don't immerse me in a world like Metroid does except for Zero Mission. That one sucked. Back on track though. The first Metroid game I played was Fusion. It's the one that got me hooked. I spent about 2 weeks playing it constantly, hardly ever putting it down. Then I discovered a no-item game challenge on some forum for it. After that, it was another month before I put it down. Ever since, I've been a Metroid fan.