Level 1 - Inner Walls, Main Atrium, and Hanging Gardens
The first couple floors of the Castle as well as the front and back gates of the Castle are included here. Entering through the outer walls, one will find himself standing on a long stretch of land that eventually leads to a bridge that will bring him into the castle. The long hallway he enters into is fairly basic but a common place for simple gatherings. This hall leads to an internal jungle of sorts ripe with plants, animal life, and of course, vegetative monsters. Past this area is a shorter hall and a shorter outer area.
Level 2 - Infirmary, Wizardry Lab, and Alchemy Lab
The western section of the next couple floors of the castle. The wizardry and alchemy labs are places where wizards and alchemists (noe really?!) go to perform their arts, brew potions, or heal the wounded at the infirmary, which overlooks the front end of the castle.
Level 2 - Ballroom and Dining Hall
The Ballroom and Dining Halls are connected in one general area, but the two main rooms are separated by a thin wall with open windows to see into one area from the other. It is the place where many a castle party is held and where couples can go to sing and dance and enjoy themselves, even if they are undead!
Level 3 - Grand Library
The library is no longer long, but tall. Generally cake like, the library starts out general in theme at the bottom couple of floors and slowly becomes more specialized as it moves upwards. Resting at the top is the Master Librarian and a selection of rare and dangerous books ranging from holding evil hexes and curses to 1001 ways to make lentil soup.
Level 3 - Guest House and Servant's Quarters
The bed rooms are on the other end of the castle and are tiered in a way that the guest rooms are on the bottom of the tower and the actual servant's quarters are nearer the top.
Level 4 - Cog Towers
A splice between a mad laboratory and the more traditional clock towers of the games, these two cog towers not only provide energy to the castle but also provide room for scientists to perform experiments and summon monsters or beasts to mess around with. The tower overlooking the front of the castle is where the scientists primarily operate, whereas the tower closer to the library holds most of the cogs and the clock at the roof.
Level 4 - Holy Chapel
Accessible from both the servant's quarters and the main atrium on the ground level, the holy chapel is a place for those who are religious to pray, and for those who have been killed in battle to be honored. Despite being a holy place, most of the inhabitants of the castle are able to enter. Care is taken there to keep any holy symbols and water made of wood and un-blessed due to allergies.
Level 5 - Recreation Rooms
The most peaceful couple floors in the entire castle. The rec rooms feature bars, pool, bingo, and other such recreational things for the inhabitants of the castle to take part in. It is where most games are played and social parties are held.
Level 6 - The Keep
The keep is directly above the rec rooms and is strictly off limits to most inhabitants of the castle. It consists of a wide tower which houses emergency supplies as well as leads to the grand throne room, where Alucard sleeps and spends most of his time when he isn't studying in the library. Above the throne room is the chaos vortex.
Basement Level 1 - The Arena
The Arena is where the inhabitants of the castle gather to prove their might in battle against one another. Many a rival fights here, often to the death if the rivalry was bitter enough. Spectators often gather to watch these matches and may place bets on the victor.
Basement Level 1 - The Dungeons
A long, winding set of corridors beneath the eastern wing of the castle which leads to prison cells, torture chambers, death pits, and graveyards. Although some of these sections are not actively used under Alucard's lordship, remnants of his father's past resourcefulness are still present in this area and serve as a gruesome reminder to current prisoners to not step out of line.
Decimated by the monster invasion, Claudiu Village is now a place of transience for hunters and monsters alike, with abandoned buildings converted to inns and shops that sell weapons and potions. The Luminata Tavern is the most prominent business, where people go to forget their woes and to find work.
Nestled between the forest and the castle, this crescent shaped lake is home to a host of sea-dwelling creatures such as serpents and mermen. Although monsters reside in the lake, they are mostly benevolent, and the waters are considered to be sacred.
The Cursed Forest
Corrupt energies from The Chaos Realm bled into this forest, cursing the trees and the wild life, and turning them into mutants--breeding vegetative monsters, were-beasts, and other such fiends. It remains a dangerous place to traverse, even to inhabitants of the castle.
The infamous changing castle, Castlevania. Most monsters loyal to Alucard reside here.