Post what you think is one of the best US/EU Famicom exclusives.
Startropics is an easy entry on the shortlist.
I also love TMNT Tournament Fighters - it's better than the 1st party Joy Mech Fight which was ironically a JP exclusive.
We actually have an existing thread about this already - here: https://www.famicomworld.com/forum/index.php?topic=10650.0;wap2
And a great writeup from Hardcore Gaming 101 - here: http://hg101.proboards.com/thread/11019/unreleased-japan-list-nes-exclusives