Castlevania: Symphony of the Night is a classic non-linear 2D platformer. You are Alucard, dhampir son of Dracula. Alucard arrives at his father's castle in order to rid the world of its evil. Along the way, you'll do battle with Dracula's horrors and cross paths with legendary vampire hunter Richter Belmont.
Symphony of the Night is the game that gave the second half of "Metroidvania" its name. It's a sprawling exploration-based game full of secrets and upgrades to find. While it's not the first non-linear Castlevania, it's arguably the most iconic, giving rise to several successful sequels on the Game Boy Advance and Nintendo DS. The game has had several re-releases, hopping across generations and platforms.