Full route
Walkthrough route and boss order
Order that matches the published chapters
IGN's chapter pages and the Fextralife boss table agree on the spine. Start on the Streets of Paris and beat The Fallen. Prison Tower (The Warrior) and Holy Innocents' Cemetery (The Prophetess) can be done in either order. The Catacombs of Paris open only after you hold all three guardian keys.
Dracula's castle comes next: Main Hall, Library, and Clock Tower. Notre-Dame opens from a painting in the Main Hall once you have The Builder, The Artist, The Occultist, and Brauner's Paintbrush. Death waits in the Choir. After that, the Four Virtues, Isaac at the Heart of the Clock, and Dracula in the Master's Quarters, in two phases.
- Arcane Whip — defeat The Fallen.
- Holy Light — defeat The Warrior.
- Smash — The Builder, after Talos.
- Aerial Rush — The Artist, after Brauner. Carmilla also hands you the paintbrush and an Aerial Rush reward in the Library.
- Double Jump — The Shadow, after Death in the Notre-Dame Choir.
What this hub does not pretend to be
Room-by-room castle directions are thinner in the public writeups than the Paris chapters. Where a turn is only implied, the chapter page says so instead of inventing a corridor. Use the area map pages for what is in a zone, and these chapter pages for the order you walk it.
What I ran into
I laid the IGN chapter titles next to the boss HP table and only kept a step when both named the same room. The castle stretch is the part I trust least turn by turn, so the Dracula's Castle page flags that limit in the first section.
Castlevania: Belmont’s Curse Gameplay and Commentary Trailer
Questions
Which guardian should I fight first?
The Warrior and The Prophetess are interchangeable. The Fallen has to come before either key matters, because the catacombs want all three keys.
Where do I go after the first boss?
After The Fallen, leave the Gate to the Catacombs and choose Prison Tower or Holy Innocents' Cemetery. Both are on the Paris side of the map.