I think the original Tetris is the best! But I am pretty sure there are some versions out there that mimic the original. If I get nostalgic, I just get out my old green screen Gameboy and play the original.
I don't like many of the new ones they make no sense. If I could find the charger for my SP(Lost my Gameboy, Pocket and Colour T_T) I'd be playing Tetris...and Pokemon, luv my little Pikachu in Yellow Version. But Tetris is the best, I really wish the DS played those games, then I wouldn't have to live my life without it =/