The NES was the birthplace of many sequels, based on earlier games. Sometimes, they were spin offs from these games too.
Castlevania III was released by Konami in 1990. It would be the final game released in the Castlevania franchise on the NES and wouldn't pick up with the main series until Super Castlevania IV on the SNES. It came in that Konami silver box.
Castlevania III went back to the more traditional style of gameplay. Instead of the RPG elements, we were back with the action platforming. The game was different though, as it had branching paths, where players could find all new bosses, events and even meet new characters in Grant, Sypha and Alucard. It took everything we knew and loved about the first game and ramped it way up.