After fighting his way through a richly decorated great hall, Richter somehow starts this level right in the middle of a dungeon located somewhere in a large complex of caverns beneath the castle. Old cells with long-forgotten prisoners can be seen in the background as he attempts to find a way out of this place.
One section is a reimagined version of the tall vertical waterworks room that preceded the alternate boss fight in the first stage of Rondo of Blood. If Richter brought the Key he found in the Great Hall all the way to this room, he'll be able to unlock the door to the cell where Maria is held prisoner. The key won't be lost upon usage, however, so he can opt to keep it afterward in his quest of finding Annet.
Richter will eventually reach the room that leads to the boss fight. If he was able to bring the key all the way here, he can then unlock the door that gives access to Stage 5', where Annet is kept prisoner. If, on the other hand, he proceeds directly to the boss room, he'll be confronted by Minotaurusu, an imposing were-bull who wields a greataxe.
|Enemy Data: Dungeon (Stage 4)|
|Image||Name - Game|
|'|| HP: 1|| 1. Town, 2. Entrance, 4. Dungeon, 7. Dracula|
|'|| HP: 1|| 1. Town, 2. Entrance, 3. Hall, 4. Dungeon, 4'. Caves, 6. Clock Tower|
|'|| HP: 1|| 1. Town, 3. Hall, 4. Dungeon, 4'. Caves|
|'|| HP: 2|| 1. Town, 3. Hall, 4. Dungeon, 6. Clock Tower, 7. Dracula|
|'|| HP: 7|| 4. Dungeon, 4'. Caves, 5. Courtyard, 6. Clock Tower|
|'|| HP: 2|| 4. Dungeon, 5. Courtyard, 6. Clock Tower|
|'|| HP: 1|| 4. Dungeon, 5. Courtyard|
|'|| 4. Dungeon, 5'. Sunken City, 6. Clock Tower|
|'|| 4. Dungeon|
- Maria can be found in this stage. A Key is required in order to open her cell (obtained in the previous stage).
- If Richter was knocked off to the pit in the Great Hall, he will end up in the Caves (Stage 4'), an alternate section of this stage. Both areas are separated from each other, with no way of reaching the same rooms even if they're technically part of the same stage.