This is a beta version of Castlevania: The New Generation (Europe), meaning it's an unfinished pre-release version of the game. Beta versions often contain bugs, incomplete features, and different graphical elements than the final release.  The game's core gameplay would likely be similar to the final version, developed by Konami, but its overall experience would be significantly different. The differences between the beta and final versions may be subtle or substantial depending on the stage of development this version represents.

Castlevania - The New Generation (Europe) (Beta)

Castle of Illusion Starring Mickey Mouse (USA, Europe)