The original Tengen version of Tetris was the one with two player support and was pulled from the shelves to be replaced by the single player more common version.
I checked this site, but since there are no NES screen shots, I can't tell if Tetris or Tetris1 is the version I am looking for. I know I have a version that is NOT Tengen and has weird controls like the D-pad turns the block. This one is hard to play and not the one I had before.
Any ideas?