Castlevania: Chorus of Mysteries is a platformer game by a collaborative team of developers, officially released on June 18, 2007. This project is a hack of the original Castlevania for NES, developed over a year by Optomon, who handled coding, music, and some level design, while another developer focused on graphics, additional level design, and the map.

In Castlevania: Chorus of Mysteries, players navigate through newly designed levels, utilizing a variety of sub-weapons and facing off against unique enemies and bosses. The gameplay retains the classic platforming mechanics of the original while introducing fresh elements to enhance the experience.

The storyline of Castlevania: Chorus of Mysteries follows a new adventure set in the iconic vampire-hunting universe, where players must confront dark forces and uncover hidden secrets throughout the reimagined levels.

Castlevania: Chorus of Mysteries stands out with its extensive modifications, including new graphics, music, and level paths, providing a unique twist on the beloved classic while maintaining its core essence.