(click here for full boxart)
wikipedia, on this game posted:
Dungeons & Dragons: Warriors of the Eternal Sun is a console role-playing game developed for the Sega Mega Drive by Westwood Associates in 1992. It is based on the Dungeons & Dragons (D&D) game rules, and uses the D&D Hollow World campaign setting.
Yes, Warriors of the Eternal Sun (nothing to do with Dark Sun at all) is built on a proper D&D license (unlike Final Fantasy which just ripped it off). "Based on Dungeons & Dragons game rules" means that it's ancient even by the standards of us old fogies who feel at home with AD&D second edition. We're talking oldschool here, back when only humans could belong to different character classes and every dwarf you met was an axe-swinging maniac.
...wait, what do you mean, you "don't see the difference"?