Just post the first game that comes to mind for the system upon seeing the topic title. It must be a game that was released on that system in some way (digital releases, compilations, remakes/ports, etc are fine, backwards compatibility is not).
NES results:
https://gamefaqs.gamespot.com/a/forum/0/0454627a.png
I'm shocked. Today could be potentially interesting though!
Previous Results:
Day 1: NES
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Super Mario Bros. (53.03%)
> Mega Man 2 (6.06%) = Super Mario Bros. 3 (6.06%) [66 votes]