You've got to play this game to consider yourself a worthy gamer.

User Rating: 9.7 | Akumajou Dracula X: Gekka no Yasoukyoku (PSOne Books) PS
This is the best of the best (meaning the best of castlevania). You play as Alucard (really smart people know that this is "Darcula" spelled backwards) in his atempt to find Richter Belmont. His search leads him to his father's castle (yes, he is the son of Dracula), and your story begins. With the weapons system, hidden spells, secrets, and hours of gameplay, you have to have played this game to be considered a worthy gamer, and if you call yourself a castlevania fan...
Still, this game is graphically dated, and those of you who hate sidescrollers will still hat them. If you know where to find this game, go looking there. If you don't, start looking.