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Mastered The Little Mermaid
(lemmy.ml)
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.