Metroid is definitely the hardest because you have no indication of how well you are doing, but Super Metroid is close after that. Super with no guide, some of the power ups are pretty much impossible to find, since the game breaks its own rules occasionally. Those white dots don't always mean...
i used to go out to the recycling center every couple weeks and look at the crts and other electronics people would drop off. Usually screens were broken or severely scratched from being tossed around. Did find a good one here and there, but never anything like a 1080i widescreen crt.
I have a few of those boat anchors in my basement I tried giving away but no one wanted them, So anyone close to Columbus, Ohio area that wants them, (26", 2x 19") please come get, for free.
Is it piracy if it was released for free? Not in my opinion, but I also think it's not piracy if buying it isn't owning it, and it's not piracy if you can't buy it from the original creators anymore.