Castlevania II: Simon’s Quest was known as ドラキュラⅡ 呪いの封印 (Dracula II: Noroi no Fūin) in Japan. The subtitle translates as Curse of the Seal, referring to the deadly curse on Simon Belmont.
It didn’t take gamers long to notice that many features in Castlevania II: Simon’s Quest were similar to that of Metroid. The game’s director instead claims it was based on the Konami game The Maze of Galious.
Dracula has a tombstone reading 1431-1476 in Castlevania II: Simon’s Quest, the life span of Vlad the Implaer from literal history.
The inaccurate text of the NPCs in Castlevania II: Simon’s Quest was originally blamed on mistranslation. But in Japan, these characters would lie for the fun of it.
Carmilla first appears as a boss in Castlevania II: Simon’s Quest, ironically as a floating mask rather than her succubus-like vampire form later. Konami based her on the fictional vampire of the same name, one of the first female vampires in writing.