Quote Originally Posted by Rase
Well, I have played the original two Metoid games for the NES though admitadlly a long while ago. Is it much different than those?
There was only one Metroid game for the NES. Metroid II: Return of Samus was for the GameBoy.

And no, Super Metroid isn't too different. It's just that it expands upon everything the first two games introduced a millionfold and then introduces a load of new concepts itself.