From the Super Mario Wiki
Dracula's Castle is a new stage in Super Smash Bros. Ultimate. It is based on the location of the same name from the Castlevania series and appears as the home stage of Simon and Richter Belmont. It is described as being the darkest stage in the game.
Within the stage, there are candlesticks that, when attacked, will spawn items for the player to use during battle. Several enemies that have appeared throughout the Castlevania series appear in this stage, including a Mummy, Medusa, the Creature and Flea Man, Death, Carmilla in her mask form, and a Werewolf. Dracula himself appears as a boss, although he only appears under certain conditions. Kid Dracula from the Famicom title Akumajō Special: Boku Dracula-kun, a parody of the Castlevania series, also makes an appearance in some capacity.
Players have the option to choose from any of the 34 music tracks from throughout the Castlevania series that can be played in the stage, including classic tracks and new arrangements.
The stage environment was also used as the background for the trailer "Vampire Killer".
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