A 1997 side-scrolling action-adventure starring Alucard that pioneered the non-linear "Metroidvania" structure with exploration, backtracking, and RPG-style progression.
- Developer: Konami (KCET)
- Genre: Action-adventure (Metroidvania)
- Platforms: PlayStation (1997); Sega Saturn (JP), later PSN, Xbox Live Arcade, mobile, and collections
- Mechanics: Open castle exploration with ability-gated areas, equipment and stats, spell inputs, familiars, inverted castle
- Notable: Seminal influence on Metroidvania design, acclaimed soundtrack and pixel art, enduring critical legacy