Castlevania- Wartime strategy game for the Atari 7800 ProSystem where you control a castle in medieval Romania and lead your armies to victory and conquer the castles of the enemy.
Castlevania 2: Simon's Quest - An attempt at adding greater plot to the Castlevania series, in this game you play as exiled Prince Simon, who with a rag-tag band must take back the fortress of your evil cousin, and then go from there to more traditional Castlevania gameplay and re-unite Romania. Poorly received.
Castlevania 3: Dracula's Quest - A "rethinking" of Castlevania 2's plot, which adds supernatural elements, most notably replacing your evil cousin with Dracula, and the enemy princes with vampires. Criticized by some fans of the original Castlevania, but a large seller that would decide the direction of the series.
Super Castlevania "IV" - The first Castlevania for the Atari 9600 HyperSystem, it was a remake of Castlevania 1 with the addition of the supernatural elements from Castlevania 3.
Castlevania: Dracula X - This game brought the Castlevania series to the modern day, in which you must take on the Romanian dictator who is revealed to be the tenth reincarnation of Dracula, and then command the armies of Romania to wipe out the resistance.
Castlevania: Dracula X: Rondo of Blood - This game for the portable Atari 9100 StarSystem was a fighting game that used characters from Dracula X and Super Castlevania IV.
Castlevania: Symphony of the Night - A dramatic change of the series, as this game you play as a prince who goes to reclaim the throne of his father... revealing only part of the way through that you are in fact the first reincarnation of Dracula.
Castlevania: Circle of the Moon - The sequel to SOTN, this game brought the series to the Atari 12000 NeoSystem and in stunning 3d battle scenes, as you command the armies of Hungary against the armies of Dracula II from the previous game. The "action sequences" have been eliminated and the game returns the series to it's strategy roots.
Castlevania: Harmony of Dissonance - This game is often seen as being merely an "expansion pack" for Circle of the Moon, it shows the united kingdoms of Hungary and Romania going against the Byzantine Empire, which is logically enough revealed as being led by Satan. (initially this was the Turkish Empire, but was changed to avoid being anti-Muslim) You are forced to ally with the surviving vampires to take down a far greater foe.
Castlevania: Aria of Sorrow - Immediately after Harmony of Dissonance, the armies of Hungary turned on their allied vampires to wipe them off of the face of the earth. To make matters worse, the third reincarnation of Dracula has been discovered in the feudal domains of Lord Roderick of Bosnia as a small child. As said Lord, you must decide whether to support the King of Hungary or the vampires. Though, these two paths converge in the game's ending, which leaves much up to question.
Castlevania: Dawn of Sorrow - This game refuses to clear up AoS's ambiguous ending by instead jumping to the future, as a sequel to Dracula X, now on the Atari 14000 X-System. As the leader of the Romanian Commonwealth, you are urged on by your advisors to crush the Greeks in what seems like a modernized version of Harmony of Dissonance. However, it proves to be much darker than that, when your advisors prove to be vampiric agents. Later, the first Castlevania to be ported off of an Atari system when it is brought to the Sega Pluto.
Castlevania: Portrait of Ruin - In the nuclear aftermath of Dawn of Sorrow, the Balkan peninsula has become a ruin. People cry out for a savior, and they have found on, in the shadowy figure known only as Arucado. (which may have supposed to have been Alucard) As the commander of the surviving Romanian forces, you must decide whether to support this man, or to go against him.
Castlevania: Order of Ecclesia - The first true portable Castlevania game, for the Commodore Ami, taking place in the wide gap between Aria of Sorrow and Dracula X, you command an expeditionary force of the Catholic Empire on their quest to take down the vampire-led Transylvanian Empire.