I'm kinda surprised that Ninja Gaiden never got ported to the Atari 7800 back in the day. The Lynx had two Ninja Gaiden games and it would have filled the action-platformer genre gap on the 7800 much more nicely than Scrapyard Dog.
I'm more surprised Atari Corp was able to get Ninja Gaiden 3 on the Lynx. At least they got arcade versions of the first NG and Rygar to get around the Big N's exclusivness.