I've never played the original, but I had the Genesis version as a kid. That game was hard, so ridiculously hard and when I did finally manage to make it to the end, i didn't have enough time left to kill the boss and finish the game. You had 60 minutes or something like that to beat it. I spent a lot of time playing it though, I think I did beat it eventually but if I did it was overshadowed by that first time making it to the end with just not quite enough time. I tried from that last password over and over again and just couldn't do it.