I can still remember playing it for the first time in 1985. A family friend of ours had just purchased an NES and had Duck Hunt/SMB. I was all of 6 years old and my little brain was just.... floored. I had already played a bunch of games on the Atari 2600 by that point and even some Magnavox Odyssey² games, but nothing was like the NES.
A few days later, my mom drove us to the store and I got my own system. Most innovative software ever imo.