Castlevania: Circle of the Moon is a landmark action-RPG and a launch title for the Game Boy Advance. Set in 1830, players take the role of Nathan Graves as he ventures into Dracula’s castle to rescue his mentor. The game is renowned for its innovative 'Dual Set System' (DSS), allowing players to combine magical cards to unlock over 100 unique ability combinations. Explore a vast, non-linear castle, defeat formidable bosses, and upgrade your attributes. With its atmospheric music and challenging gameplay, Circle of the Moon is a must-play entry in the Metroidvania genre.