World Heroes 2 [Model NGM-057]

World Heroes 2 was released in April 1993.

Captain Kidd is based on the real Captain William Kidd (1645-1701).
Erick is loosely based on Erik the Red.
Mudman is similar to protagonist of Daijiro Morohoshi's "Mud Men" series in Monthly Shonen Champion Z?kan.
Ryoko is based on famous real-life judoka Ryoko Tani (formerly Ryoko Tamura). Fighter's History, released in the same year as this game, featured a character with the same basis and name (on a related note).
Shura is based on the legendary Muay Thai hero Nai Khanom Tom.
The last boss of this game was inspired by the character 'Baoh' from the manga of the same name.

The difficulty setting seems to have no effect on the game, the game is just as difficult on Level 1 as it is on Level 8!

The 'Skinhead' Deathmatch level, like in the first game, does not feature any trap or hazard to look out for, however the loser in this particular ring will get his/her head shaven! :)

Soundtrack releases:
[JP] June 18, 1993 - World Heroes 2 [GSM 1500 Series] [PCCB-00122]
[JP] Oct. 21, 1993 - World Heroes 2 Image Album [PCCB-00137]

Literature:
[JP] Sep. 30, 1993 - World Heroes 2 [Gamest Extra No.99]