This honestly is a fun game but wow the optimization to make this game work on the NES is not great. There's so much flicker everywhere and it makes it hard to look at. I'm sure some of the other ports probably don't have this issue but for me this NES port is only just good.

Also it seems they changed some things for this US version. In japan's original version you actually go to locations in a different order and IDK if I'm missing something but it seems like the US version added a new final fight were you face yourself for the last team in USSR. Maybe you can do it in the Japanese version but I haven't figured it out.