The First Metroid. We had a shop nearby with a NES and the multi cartridge switcher. There was Zelda, Super Mario and all the rest. But Metroid always caught my attention. To this day I think metroidvanias are my fav genre.
I had the Nintendo Power issue with the Metroid maps in storage until relatively recently. I have great memories of that game even though it wasn't the one that really sparked my interest in it being a hobby.