The magnum opus of the NES, for my money. Nothing really comes quite this close imo, it's honestly breathtaking even today, especially for the hardware. No idea how it was pulled off, but you can tell it was just barely, because the most common complaint is pretty copious amounts of slowdown. I find it to be quite manageable, especially because this game is really easy, but it's worth a mention. Also copy abilities are in a bit of a rough state at this point in time, they're fun to use and all but if you lose one getting it back is much more of a hassle than it is in future installments. That's it for gripes though, this is completely insane given the limitations and it always brings me bundles of joy even tens of playthroughs later. Very incredible stuff.