This game was known as "Fist of the North Star 2" in Japan and as stated above featured FAR more violence than its US counterpart as well as different colors.
This also allowed Sega of America to bypass purchasing the rights from the anime creators for the US release. To that end many human boss characters were changed into aliens with green or red skin and all of the names in the game were changed.
Fist of the North Star 2 would have been the sequel to the NES game "Fist of the North Star" had it been released with its title intact.
Another reason for the name change was that Nintendo had a rule with all of its third party licensees that if they released a game for the Nintendo they had to wait two years to release it for a competing system. Because of that the company, Taxan, who had released "Fist of the North Star" for the NES in 1989 would not have sold the rights to Sega to release another Fist of the North Star game in the same year. Add
Did You Know?
The Western release is a "tamed" version of the original Japanese game, based on the Fist of the North Star manga/anime series. In the original game enemies died gruesomely as their head exploded, but in the Western version they fly away - think of the Romans in the Astérix comics and you get the picture. Add