Just made all retroachievemens in this game in hardcode mode (without save states). Probably the easiest NES game with the easiest achievement set.
If you have never played, I recommend giving it a try. The gameplay is great, nice soundtrack.
What is the easiest game for NES in your opinion?
No idea. I also have a backbone and use it for steam link games with great success and there are several games that have native phone support for it.