In case you're not aware, Castlevania Anniversary Collection is now available on Steam (as well as on PlayStation 4, Switch and Xbox One). It includes the following games:

• Castlevania (NES)
  
• Castlevania II: Simon's Quest (NES)
  
• Castlevania III: Dracula's Curse (NES)
  
• Super Castlevania IV (SNES)
  
• Castlevania: The Adventure (Game Boy)
  
• Castlevania II: Belmont's Revenge (Game Boy)
  
• Castlevania: Bloodlines (Genesis)
  
• Kid Dracula (NES)

The collection also includes some really cool extras in the form of design docs and concept art for each game. Definitely read the reviews to get an idea as to what sort of issues the package has at the moment, as there are certainly a number of oversights in the PC version (some of which also plague the console releases). That said, I've really enjoyed my time with this collection on Xbox One X, and I daresay that the aforementioned design docs and concept art alone are worth the asking price for a serious Castlevania fan.

https://store.steampowered.com/app/1018010/